Harness
 

I KNOW THERE IS A HARNESS TO ADD SUBS AND AMP. BUT HOW ABOUT ONE TO SEND SIGNAL TO FACTORY SPEAKERS USING AFTERMARKET AMP.
:huh:

Yes there is, reach out to fellow seasoned member Technic, who provides different harness options. I just got mine from him. The speakers are actually not bad with more power going to them. How well they hold up and for how long seems up in the air and trivial at this point and dependent on the user. I power the rear deck stock speakers with it and my doors and underseats are aftermarket.

he is unreachable :))

Try on DIYMA.

Car Audio | DiyMobileAudio.com | Car Stereo Forum - View Profile: Technic

He's not unreachable, just hard to reach lol. He's the only guy that provides a true BMW PNP harness so imagine the volume of emails he gets. Keep trying via PM and via Bimmerfest.com PM as well.