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2003-2006 Infiniti G35 sedan

2003 • 2004 • 2005 • 2006

Rick Carlton has served as a professional automotive/motorsports journalist, writer, researcher, editor, and publisher for thirty years. He has also served as a press/media consultant for a range of professional motorsports organizations. He contributed several vehicle profile articles to Crutchfield's Research Garage.

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2003-04 Infiniti G35

In a Nutshell

In this article, we'll tell you how to install car audio gear in your G35 sedan. The stock stereos aren't terrible in these cars, but you'll still see a real improvement when you replace the old gear with new aftermarket equipment.

Removing the receiver is a bit challenging, but it's not an impossible task for the do-it-yourselfer. Just stay organized, work patiently, and you can handle it.

Upgrading the speakers also comes with a few challenges, but it's worth the effort. These are well-built cars that can handle serious sound. Thus, adding amps and a subwoofer or two can really make a difference.

Full Story

Overview of the Infiniti G35 Sedan

Long before the successful G20 line closed out its run, Infiniti was already hard at work on the car they hoped would make them more than just another high-end Japanese import. The new car had to be luxurious, it had to be powerful, and it had to be good enough to compete on even footing with Europe's best luxury touring sedans. The car they created, the G35 sedan, was all that and more.

This nimble 4-door sedan certainly looked the part, with sleek,  Euro-flavored styling and enough high-tech interior gadgetry to make a computer scientist blush. Infiniti made sure the "go" equalled the "show" by dropping in a torquey 260-horsepower 3.5 liter V6 engine and tuning the independent suspension system to provide just the right combination of ride and handling. Automotive journalists love this sort of thing, and they dutifully showered the G35 with well-earned praise and awards.

The G35 wasn't just another high-end Japanese import. In some ways, it may have been a better "European" sports sedan than some of its European competitors. Even now, the G35 is a smart purchase for anyone who values the practicality of a sedan and the performance of a sports car. The factory stereo wasn't bad in its day, but a new aftermarket system will really make your G35 sedan sing.

This article is an overview of your vehicle's audio system and its upgrade options. If you're looking for step-by-step instructions on installing a car stereo or speakers in your G35, we'll include a Crutchfield MasterSheet™ free with your Crutchfield order, or you can purchase one for $9.99.

Infiniti G35 console

2003-2004 Infiniti G35 sedan console with Bose package (Crutchfield Research Photo)

Factory stereo system

The G35's factory AM/FM/CD receiver is located in an accessory stack situated between the front seats. The unit is surrounded by a series of plastic dash panels that help it blend in with the in with the interior's subtle, sophisticated aesthetic.

For the 2005 model year, the G35 got a freshened interior, which included a new dash and center console. Removing the 2005-06 factory receiver is thus a very different procedure than it is on the '03 and '04 models. No matter which one you have, you'll find detailed instructions in the Crutchfield MasterSheet™ that's included free with your stereo purchase.

The standard speaker system, which stayed the same throughout the model run, carries a combo tweeter/ woofer setup at the front of the cabin. You'll find 1" tweeters in each door’s sail panel (at the top of the front door), in addition to 6-1/2" woofers placed at the bottom front of each door panel. In the rear cabin, 6-1/2" woofers are placed at the bottom front of each rear door, level with the edge of the floor well. 

The optional Bose system adds a cassette player to the AM/FM/CD stereo, plus upgraded speakers, a trunk-mounted 200w per side amplifier and an 8" subwoofer in the rear deck.

infinity g35 dash cavity

It looks worse than it is, trust us! (Crutchfield Research Photo)

Replacing your factory radio

The dash disassembly process is somewhat involved on both versions of the G35, but the removal process really isn't as complex as it looks. The '03-'04 edition is a bit more complicated, but it's nothing the average DIY-er can't handle. You'll only need simple hand tools to disassemble the panels and brackets.

The factory stereo is thoroughly integrated into the center console on all G35 models, so replacing the unit requires the use of a dash kit that allows you to install a new single-sized (2" tall) or double-sized (4" tall) receiver in the G35's dash panel.

This kit, which is available at a deep discount when you purchase your new car stereo from Crutchfield, blends seamlessly into the interior and retains all heating, ventilation, and air conditioning controls. You'll also save money on the wiring harness and antenna adapter needed to install your new receiver.

Tools required: Panel tool, Phillips screwdriver, flat-bladed screwdriver

Shop for car stereos that fit your Infiniti G35

Steering wheel audio controls

It's relatively easy to retain the steering wheel audio controls when you install a new stereo in your G35 sedan. When you enter your vehicle information, our database will choose the adapter you need to make your factory steering wheel controls work with your new receiver.

Replacing your factory speakers

Replacing the speakers will offer a few challenges, but it's nothing the average do-it-yourselfer can't handle.

infinity g35 frotn door speaker

The G35 has midrange speakers in the front doors (Crutchfield Research Photo)

Front door speakers

The factory speaker system uses a hi/lo configuration, with tweeters placed approximately chest-high in the sail panels and a midrange woofer at the bottom front of each front door. To access these components you will have to remove the door panel.

Once the panel is free of the door, you can get to the tweeter by prying off two clips and lifting the entire sail panel/ tweeter assembly off the window pillar. The speaker itself is secured to the assembly by a retaining clip. After you remove the screws and disengage the plastic clip, the cone will come free of the assembly.

If your new tweeter is no more than 1.1" in diameter, you can try to mount it just like the factory tweeter. But due to the way the factory tweeter is arranged, it might be easier to mount the new tweeter directly to the back of the sail panel.

In the case of the woofers, simply unscrew four Phillips screws from the door bracket and lift the cone away from the assembly. The factory speaker is an "oversized" 6-3/4" speaker and many 6-3/4" replacements will fit. You can also install regular 6-1/2" or 5-1/4" speakers with the help of a mounting bracket, which is available at a discount with your Crutchfield purchase.

Bear in mind that there aren't any wiring harnesses available for the G35's speaker connectors, so you'll need to order Posi-Products speaker connectors.

Rear speaker in the door

The rear door speakers are also pretty easy to deal with (Crutchfield Research Photo)

Rear door speakers

Rear speaker removal and replacement for the G35 offers a similar bracketing configuration as the front door woofer installation.

The rear doors use the same speaker sizes as the front door. There isn't as much room between the speaker and the door panel as there was up front, so the range of available replacements is a bit smaller. If you choose 6-1/2" or 5-1/4" speakers, you'll need mounting brackets, which we'll include at a special discount price with your new speakers.

Speakers in the Bose system

With the Bose system, door panel removal is the same, but the speaker sizing is a little different. The front doors fit mostly the same speakers as the standard system: 6-3/4", 6-1/2", or 5-1/4" speakers. The rear doors use a 5-1/4" speaker, but if you're willing to drill new screw holes in the door, you can fit a 6-1/2" speaker. Otherwise, you won't have to drill new screw holes when replacing speakers in the Bose system.

Luckily, wiring harnesses are available for G35's equipped with the Bose speaker system, so it'll be a tad bit easier to install new speakers. These harnesses – and mounting brackets, if needed – are available at a special discount price with your Crutchfield speaker purchase.

Tools required: Panel tool, Phillips screwdriver, flat-bladed screwdriver, and maybe a drill and 1/8" bit

Shop for speakers that fit your Infiniti G35

G35 factory subwoofer

The factory Bose subwoofer is mounted in the rear deck. The amp is just to the right. (Crutchfield Research Photo)

Bass in your Infiniti G35

The G35's Bose system includes an 8" subwoofer installed in the rear deck. There is no wiring adapter for this system, so if you replace the factory subwoofer, you'll have to splice the wires and drill new mounting holes in the deck to secure it.

The Bose system uses a low-impedance woofer and a low-powered amp. If you replace this subwoofer, you should also replace the amplifier.

There's plenty of room in the trunk for a subwoofer box and amplifier, so you can add a bass system to provide the bottom-fill that the door speakers can't recreate.

Other options for your G35

There are plenty of other ways to improve your G35 sedan. Here are a few suggestions:

iPod® and satellite radio adapters

Crutchfield carries a variety of adapters that let you add iPod control or satellite radio to your factory stereo system. Of course, if you're replacing the factory stereo, your new receiver will most likely feature built-in iPod control. You can also add satellite radio to most aftermarket stereos.

Security systems

Installing a security system in your G35 sedan isn't easy (security systems rarely are), but it's definitely a good idea. Our Crutchfield Advisors can help figure out what you need to get the job done, but we usually recommend taking your car and new gear to a professional installer.

Shop for car security systems for your Infiniti G35

Find the audio gear that fits your car or truck

Visit our Outfit My Car page and enter your vehicle information to see stereos, speakers, subs, and other audio accessories that will work in your vehicle.

Last updated March 20, 2017
  • Harlin kerney from West sacramento

    Posted on 7/28/2015 10:55:10 PM

    Are all the speakers ran to the amp in the trunk or just the 8" subwoofer?

  • Jon Paulette from Crutchfield

    Posted on 7/29/2015 1:26:32 PM

    Harlin, Yes, all the speakers are run by the amplifier.

  • steve smith from Indianapolis

    Posted on 8/2/2015 10:14:28 AM

    where is the amplifier? is it in that black box to the right of the subwoofer?

  • Jon Paulette from Crutchfield

    Posted on 8/3/2015 10:11:40 AM

    Steve, Good guess! The amplifier is located on the underside of the rear deck, just to the right of the sub.

  • Tim marr from Holland

    Posted on 8/9/2015 5:01:11 PM

    Why is it that my 06 g35x has hands free calling, and bose but I don't have the sat radio option or handfree streaming?

  • Jon Paulette from Crutchfield

    Posted on 8/10/2015 11:37:20 AM

    Tim, Difficult to say, really. Factory options packages can be hard to fathom sometimes. The good news is that it's not hard to add those features with an aftermarket stereo.

  • arthur from decatur

    Posted on 8/20/2015 1:42:01 AM

    Interested in speaker upgrades. Exactly what are the factory speaker sizes (front door panels, rear side panels & tweaters in sails) in the 2004 Infiniti G35 Coupe -non-Bose - base model? What is the power rating of the factory stereo system. What are your top three 2-way coaxial 4-ohm speaker recommendations?

  • Jon Paulette from Crutchfield

    Posted on 8/20/2015 11:52:01 AM

    Arthur, we sent your question to our sales team for the best answer. They'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.

  • Eddie from New york

    Posted on 9/4/2015 10:40:23 AM

    Hello i would like to upgrade my center console on my 2008 g35x sedan but my question is what happens to the controls on the original like air conditioning and etc. 2nd question is can i just install speakers and a sub without having to replace the center console ? Thank you

  • Alexander Hrabe from Crutchfield

    Posted on 9/8/2015 12:12:03 PM

    Steve, we don't recommend upgrading the stereo in this vehicle because climate controls are integrated the factory radio panel as you describe. You do have options when it comes to speakers and subs though. Give us a call and an advisor can make a recommendation based on your needs.

  • Jason mess from Okinawa

    Posted on 10/27/2015 4:13:02 AM

    I have an 2002 Nissan skyline (same as the g35 back home) I want to add an amp and subwoofer. It has an aftermarket kenwood deck already. Do I need to completely take apart the dash in order to connect the wires?

  • Jon Paulette from Crutchfield

    Posted on 10/27/2015 1:01:40 PM

    Jason, There could be some minor differences between the JDM and "export" versions, but probably not enough to matter. Generally speaking, in order to connect the amp to the audio system, you'll need to either: a) connect RCA cables and turn-on lead to the back of the stereo (which means getting into the dash), or b) if you have speakers in the rear deck, use the amp's speaker-level inputs to get audio (and turn-on signal) from the rear speakers. Depending on how hard it is to get to the speakers, this might actually be more difficult than connecting at the stereo. Hope that helps!

  • Collin

    Posted on 11/11/2015 1:15:19 AM

    I have a 2005 g35x without the premium (Bose) system. There's is an opening for the 8" subwoofer in the rear deck, but because it's not the premium model, there's just an empty opening. I am going to attempt to put an 8" Infinity Reference 1000 watt subwoofer (the 860w) in that opening. Will this work? Or will this just rattle the rear deck especially since there's no grill for the sub, like there is with the bose. Thank you.

  • Jon Paulette from Crutchfield

    Posted on 11/11/2015 10:27:12 AM

    Collin, The sub should fit in the opening. If you're worried about rattling, we stock 8" speaker grilles, not to mention Dynamat.

  • dave from eureka

    Posted on 12/2/2015 9:14:59 PM

    I have a 04 g35 with a bose sys. I would like to add satelite receiver with possible bluetooth for iphone6 I also have the popup navigation on top of the audio console. What are my options

  • Jon Paulette from Crutchfield

    Posted on 12/3/2015 8:49:57 AM

    Dave, I'm going to send your question to our sales team for the best answer. They'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.

  • Mike calcara from Ofallon

    Posted on 12/13/2015 3:12:23 AM

    I would like to upgrade just my head unit in my 04 g35x Bose If possible, with touch screen Bluetooth, usb, possible navigation, but want to keep my speaker config factory... Is this a possibility?

  • Jon Paulette from Crutchfield

    Posted on 12/14/2015 9:06:43 AM

    Mike, 'Tis indeed. I'll forward your question to our sales team, and they'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.

  • Ben from Chantilly

    Posted on 3/9/2016 10:02:03 AM

    I've been considering replacing the factory radio in my 2003 G35 sedan. However, I've been told (by the dealership) that the A/C controls are integrated with the stereo - indeed, when I pull the fuse for the radio, the A/C still runs but the controls do not work. Does replacing the factory stereo require some adapter to ensure the A/C controls are separated? Please help, I'm confused with what I was told years ago to what I'm seeing in the Crutchfield website.

  • Jon Paulette from Crutchfield

    Posted on 3/10/2016 9:13:28 AM

    Ben, That probably was true then, but these days, we offer a dash kit that allows you to replace the radio and retain all heating, ventilation, and air conditioning controls. It's available at a very nice discount when you order your stereo from Crutchfield. You can use our vehicle selector to confirm which stereos fit your car and get some info the kit and anything else needed for the installation.

  • Vincent Larouche from Long Beach

    Posted on 3/22/2016 5:34:08 PM

    I have a 2006 G35 Sedan, Non-BOSE Sys. and I'm looking for a simple and easy work around for the factory radio. About 5 years ago my dad got an AUX output and Power Cable installed for an iPhone 4 from Best Buy. The way it works is you would either plug in a male-male AUX to any device or iPhone 4 in the Power cable, flip an after market and turn the tuner to 8.79FM. It was okay... For some reason the sound quality is lower than a normal radio station, and, since the installation, the iPhone 4 cable has broken from wear and tear. (Oh, and the CD player only works when it wants to work.) I am looking for a simple kit that I could install in the factory radio that would give my Iphone 5s a direct connection to the receiver, without doing the whole radio frequency to get a better sound quality AND charge my phone too. Are there any solutions for the Non-Bose receivers? I saw a kit you could install to a factory radio that satellite radio options, making the SAT radio option an Ipod option. But I don't think I can do that with this radio. Any solutions would be greatly appreciated! Thanks, V

  • Jon Paulette from Crutchfield

    Posted on 3/23/2016 11:02:56 AM

    Vincent, I've sent your question to our sales team for the best answer, and they'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.

  • John from Rome

    Posted on 10/18/2016 10:13:41 PM

    Is it best to leave the rear door just a woofer or would a coaxial speaker improve the sound? I assume there is a reason there isn't a tweeter back there.

  • Jon Paulette from Crutchfield

    Posted on 10/19/2016 10:09:22 AM

    John, The rear speakers are the same size as the ones up front, but they're full-range. A wide variety of 2-way speakers will work just fine back there.

  • Ben

    Posted on 10/29/2016 8:01:50 PM

    I have a 2005 Infiniti g35 coupe ,,,,,what are the size of speakers are they

  • Jon Paulette from Crutchfield

    Posted on 10/31/2016 10:09:55 AM

    Ben, That all depends on a few things, but mostly whether your G35 coupe has the Bose system or not. To see all the speakers that fit your car, enter your vehicle info on our Outfit My Car page. That'll show you all the speakers that fit your G35's various speaker locations.

  • Ed from Chicago

    Posted on 1/17/2017 2:31:50 AM

    I have a 2005 Infiniti g35x with the Bose system. My rear deck subwoofer blew out a while back and I'm looking to replace it. I'm interested in buying the Sound Ordnance M2-8SVC 8" 4-ohm subwoofer from Crutchfield but I'm not sure if the amp I have already is powerful enough to handle this subwoofer or if I need to buy one that is compatible. If I do indeed need to purchase an amp, can you provide me with the best yet inexpensive options? Thanks!

  • Jon Paulette from Crutchfield

    Posted on 1/17/2017 9:40:12 AM

    Ed, We can totally help with that. Give us a call and talk to one of our expert advisors. Once we know a little about the amp you have, we can tell you if it'll work with the Sound Ordnance model you want. If it won't work, we'll help you find something that will.

  • harold from Detroit

    Posted on 1/28/2017 12:20:22 AM

    Hello, I just wanted to confirm something. It has been suggested that I can use the speaker wiring harnesses with my 2006 G35 (without Bose). However, from what I just read, this is not the case. I want to clear up if I can use the Metra speaker connectors? Additionally, in the picture related to this article about the G35, it shows an image of an amplifier next to the subwoofer. I don't have a sub; however, I have that same black piece just to the right of where it would be. I bought the car used, so if there was a sub there, it's gone now. I have no indications of Bose anywhere in the car, so I'm thinking I don't have it.

  • Jon Paulette from Crutchfield

    Posted on 1/30/2017 10:03:39 AM

    Harold, The black piece next to the sub is present in G35 sedans with or without Bose audio, so you most likely have the standard system. There aren't any wiring harnesses available for the base system speakers, so you'll need Posi-Products speaker connectors to connect your new ones. Give us a call and we'll set you up with everything you need.

  • Dale Taylor from Tucson

    Posted on 3/2/2017 11:15:35 AM

    I recently picked up a 2003 G35 and am looking to upgrade the front door speakers to start. What component speakers and tweeters fit in the stock location? I see that many brands fit speaker wise, but not tweeters? If I have to do a little modding fine but I don't want to mount the tweets on the surface.

  • Jon Paulette from Crutchfield

    Posted on 3/3/2017 9:21:32 AM

    Dale, If you're replacing the Bose speakers, most component tweeters will fit into the sail panel locations. You'll need to use our universal backstraps (or hot glue or silicone) to secure them, but they'll fit. I've forwarded this to our sales team, and they'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.

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