Well you have told me where the amp is in my 94' 530iT (left rear panel) now, can someone tell me which are the L & R output leads going TO the amp FROM the head unit. I want to "Y" into them to hook up my existing 12" single sub with its bridged amp and powered crossover. Bob Hazelwood indicated in a previous post that this was the best way to hook up the sub. but how do you ID the correct wires to splice into? Thanks for any help !!