I am currently running 4ga wiring to my amplifier. I have a pionner DEH-7800MP Headunit. Front Digital Audio 4" speakers And Pioneer 6.5" speakers in the rear. So difficult, And not alot of money to do so.. :disappoin
Yes, this car sucks for front stage (stock). Those 3.5" or 4" speakers fire into your knees, lame. I couldn't stand them so I made a set of door pods for some Infinity Kappas I had leftover from an old install, with damping pads for better midbass, higher cone breakup threshold. They sound 100x better than stock that's for sure. A Memphis PR100.2 100x2 powers them.
I have 5.25" JL XR coax in the rear stock spot, but I also added Alpine Type R 6x9's in the rear door in pods I made. I switch my rear fill due to 5.1 needs lol. Those are powered by a MTX 35x2 and the Alpines an MTX Thunder 75x2 (that amp is a beast)
The subs are the 2 Oz I mentioned, 12" in pro-made sealed box with damping pads, Second Skin vibration deadener and Cascade Audio spray and fiberfill. Head unit is JVC AVX2 3.5" Widescreen, DVD, DVD-Audio, 5.1 processor, DTS, 12 disc (plays Data-DVD for huuuuge MP3 collections) and XM (they suck) it's awesome. An Alpine center channel speaker is right below it where the stock pocket used to be. A Kicker ZX amp bridged mono to 150x1 powers it.
I spent little $ putting the system together, I really only bought materials and the PG 8.0:1 and the JVC. Everything else was leftover from old installs I had so it's ghetto-mis-matched. I put multiple layers of Second Skin Pro and RAAMAT and Ensolite all over the interior and all the trunk. My stupid carpet took forerver to fit again it sucked lol. I double sprayed the front doors with Cascade Audio deadener and the inside of the front pods. You can't hear a lot of road noise which was the point.
Jeff