Ok, I own a little '86 Toyota with no real modifications to the truck (I don't really see the point, it has 150,000 miles, it runs fine, but still I wouldn't want to waste money on something I couldn't transfer to my next vehicle). It's only a 4x2 regular cab pickup so you can imagine how hard it is to get a decent system to fit in it, but I think that my friend and I managed it pretty well. My subs are two 10 inch MTX Thunder 7000 Series (discontinued line, but the same specs as the 8000 series, just more plain looking than the 8000 series) 400 watt RMS, 1000 peak. They are driven by a Rockford Fosgate Punch 800.4, 400 watts RMS x 2 (I don't know the peak but I know it's up there a ways), I have 4 gauge wire for it. My head unit is a JVC KD-SH77 [motorized, fold-down detachable face, HS IIIi tuner, plays CDs, CD-Rs, and CD-RWs, EQ � 9 EQ presets, 3 user curves, and 3-band parametric EQ
Super Bass (8 levels of bass enhancement), 4-volt front/rear preamp outputs, 4-volt subwoofer outputs with level control and selectable low-pass filter (50, 80, or 120 Hz), DVD/VCR controls, auxiliary input (front), line input (rear), 24-bit Burr-Brown D/A converter for highly-detailed, warm CD sound, CD Text, disc and station naming (up to 40 CDs and 30 radio stations, power amp switch allows you to turn off the built-in amplifier, improving the signal to external amps, remote, 19 watts RMS/50 peak x 4 channels, CD frequency response 5-20,000 Hz, CD signal-to-noise ratio 102 dB, FM sensitivity 11.3 dBf]. I have Pioneer 6 1/2s that we managed to get into the kick panels for added highs and midranges. My truck only has two stock speakers and I replaced them with Polk 4s. I have a Optimus 100 watt amplifier powering the four speakers up front. And everything out of the head unit goes through a Radio Shack crossover that I mounted just below the head unit. I wish I had more room in my truck, but even with so much stuff I didn't lose any passenger room and everything is quite stealthy. With all the stuff I've got in the last year (I'm only 16), the cost has been $1700. I wish I had some room so I could do some things with neons and other stuff, but right now this works just fine. When I do get a different vehicle with some room...watch out!

The MTX Subs

Inside View

Pioneer 6 1/2s in kick panels

The Rockford Amp tucked under the seat

Head Unit

The sub boxes barely fit behind the seat

All that in THIS