Sound Ordnance M2-8SVC
Can't imagine beating the price and performance from an 8" sub. Fit in my 2002 Tahoe factory enclosure without modification. Plenty of low end to fill the truck without being obnoxious outside the vehicle. I did bypass my factory amp, so not sure how it would sound with that. The connection is threaded which I didn't care for, was hoping it was spring loaded like other SO subs. Not really a con, just my preference.
Pros: Easy install in 2002 Tahoe great sound for price and size