Ok I am trying to hook up my aftermarket head unit to my eclispe which has the infinity sound system with it .I want to know is there any way to just hook up the aftermarket unit bypass the infinity amp under the passenger seat if so how and what is need different. I also want to know if i do use the amp what is the process and what is the wiring diagram to the inifinity amp so i know which is the speaker wired?Because right now i get no sound out of the speakers and im bout to replace the door speakers also

 

Everyone here recommend this bypass/harness

 

I personaly would suggest hardwiring it. The colors are all ISO if I remember correctly

 

+1 It's really not that difficult