dood, I had the same problem, but one thing you might wanna check, my Focals had extremely bad alternator whine and I used ALL top of the line stuff to hook it up, twisted RCA's that cost me $120 and the such, it all turned out to be that I didnt properly solder the dropdown from behind my head unit to the wires goin from the amps to the speakers, make sure you have DAMN good soldered connections, no crimp on or twist on connections, solder dem bad boyz

1993 Eagle Talon Tsi FWD
6 bolt swap COMPLETE!
ACT flywheel, ACT 2600, Joe P MBC, Autometer boost guage, Buschur DP, Buschur high flow cat, prothane motor mounts, BM tranny lsd insert, K&N,balance shafts eliminated, EGR blocked, free mods, and sweet ass 16g @ 18psi.