Are you wanting to just amp your subs? If that's all you're wanting to do, go to any competent car audio place and get a wiring harness specific for you setup. Then get some tap in clamps you just clamp to your speaker wires that will give you outs for your sub. You won't even be messing with the factory amp at all. Once you've done this, connect the rca plugs to the end of the wires you clamped in and run directly to the amp. Something else you'll have to do is find the "remote" wire running to your head unit. This should be labeled on any aftermarket unit....actually, come to think of it, any aftermarket unit should have pre-amp outs on it already. :oops: Wasn't thinking when i started this and i'm too lazy to delete it. Ok, ignore me, I'm officially out of it now. So i just wrote a whole bunch of bs...