And what Grand Prix sound system would be complete without plenty of bass? Two Rockford Fosgate Punch HX2 12" subs in the trunk take care of that. The dual 4-ohm voice coil subs are powered by a Punch 601S amplifier (300 watts RMS x 2 @ 2 ohms), which ensures plenty of volume for the power hungry subs. Michelle can adjust the sub volume with a dash-mounted control panel, bypassing the head unit so she can dial in just the right amount of bass without altering the overall volume.

The capacitors are hidden ingeniously in the rear seat armrest.

The amps draw a lot of current, more than the Pontiac's alternator can really handle, so Matt installed two Lightning Audio LS10-03 Strike 1.0-farad capacitors to store some reserve power for loud musical bursts and other heavy draw situations. The capacitors protect the car's electrical system and help ensure smooth, even sound across the musical spectrum. Their installation behind the rear seats keeps them out of sight, conserving space, and provides a nice custom touch to Michelle's setup.

Matt custom-crafted the subwoofer enclosure from wood, fiberglass, vinyl, and carpet.

The trunk presented a new challenge. There was plenty of space, but also plenty of equipment that needed to go back there. So Matt designed a custom enclosure to hold the subs and both amps along the perimeter of the trunk, covering it with color-matched gray carpet for a professional look. The box design keeps vibration down and leaves enough space free for everyday storage.

Sometimes you're better off not knowing exactly what goes into creating a custom installation.

In the end, Michelle got what she was looking for: incredibly realistic sound from a slamming system that's really only noticeable from the trunk.