I purchased an extended cab for the sole purpose of removing the rear seat in order to install nothing but audio system components back there.
I don't compete so function was the priority.
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�A quick rundown of the system components:
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*Deck - Nakamichi CD-45Z.�
*Processors - Phoenix Gold EQ 215X eq/crossover. Kef KX-3 passive crossover networks.
*Front Stage - Kef System 160.Q Uni-Q coaxials.
*Front Stage Amp - US AMPS USA-200 (Stereo 4 ohms - rated 100 x 2).
*Sub - 2 Adire Audio Tempest (coils paralleled and subs paralleled - final load = 2 ohms).
*Sub Amp - US AMPS USA-400 (bridged @ 2 ohms - rated 1200 watts).
*Rear Fill - Infinity Reference 4x6 coaxials (bandpassed and running in mono).
*Rear Amp - US AMPS USA-25 (fed bandpassed and mono signal. Rated 12.5 x 2 at 4 ohms).�
*Wiring - Stinger Dream series interconnects.
MCM and Parts Express terminals, fusing, distribution block, speaker wire (Sound King), power wire (Monster, Amp King).�
*Stock charging system - 4 guage upgrade from alternator to battery. 2 guage upgrade from battery to chassis ground.
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Not shown in the following pictures are the pair of Infinity 4x6 coaxials used for rear fill. Also not shown is a photo of the Nakamichi CD 45Z head unit. Unfortunately I couldn't get a good picture of it (cheap digital camera).
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My truck, a 1995 Chevy Silverado extended cab. It's stock ...... hey, I'm old, stock is fine.

The entire front stage in two holes ..... This is the original Kef Kar System 160.Q 6.5" UNI-Q (point source) coaxial. That's not a dust cap in the center of the mid/woof cone, it's a sweet, 1" soft dome tweeter. Included with the set are quality passive crossover networks utilizing Litz-wound inductors and poly caps.

This shot shows the slightly modified stock door opening that houses the Kef 6.5" Uni-Q's. These stock locales are thoughtfully angled slightly upward which really helps imaging. A spacer was fabricated from 3/8" masonite to accomodate the depth of the speakers. The door was layered with 2 layers of generic (MCM Electronics) sound deadening material. The interior of the doors received a generous application of Cascade Audio spray on compound (Quiet Kote). A Cascade Audio Deflex pad was installed behind the speaker. In addition, I used part of a XTC foam baffle to help act as a drip guard.

The backside of the door trim panel was treated to a generous application of Cascade Audio's Quiet Kote, spray on dampening.

Some of the cut panels that will come together to make up the amp rack.

Partially completed enclosure/amp rack. Visible are the tops of the PVC pipes that serve as wire chases through the enclosure. They run from bottom to top and are glassed and siliconed in to assure no air leaks. Obviously, the displacement of the pipes were accounted for to assure an accurate internal volume calculation when it came to tuning the enclosure.

The enclosure is constructed from 3/4" MDF with the exception of the baffle. The Baffle consists of two lamminated sheets of 3/4" Marine Tek Ply which is a 7 ply, void free marine plywood. Evident in this picture is this double thick (1.5") baffle. Also evident is some of the internal bracing. A 1" layer of polyester batting lines all walls with the exclusion of the baffle. The enclosure has a center divider. Each chamber is 4.14 cubic feet (net) and tuned to 22 Hz with dual ports. The enclosure is convertible to sealed by simply plugging the ports. In sealed configuration, the system Q is right around .7

A picture of one of the Adire Audio "Tempest", 15" subs installed in the enclosure. Pretty plain looking but these are awesome subwoofers. All of the engineering went into the design and performance.

A shot of the open ports for ported operation.

Ports plugged with PVC pipe "test plugs" for sealed operation.

A shot of the Kef Kar 160.Q installed in the stock door provision. More clearly evident in this shot is the tweeter which resides where the dustcap normally would. Chevy thoughtfully angles these locations upward. This made it an easy decision for me to go with these point source drivers.

A shot of the amp rack which sits on top of the enclosure itself. Evident are the three US AMPS that power the system. Also evident is a Phoenix Gold EQ 215X eq/crossover as well as the Kef crossovers and some of the power wiring. As previously mentioned, PVC pipe runs through the enclosure from bottom to top. The pipes are used as wire chases to run all wiring up to the equipment rack.