Im using the PAC Rp4-ch11. It allows us to maintain the stock amplifier and also sw controls.
I am having problems with my install using Kenwood radio. Im still troubleshooting and starting to think its the PAC interface. Since others are saying they didnt have any problems with same harness, maybe I just got a bad one.
Im going to try to use RCA preamp outputs instead of speaker outputs. If that doesnt work, I will get Crutchfield to send another harness. If after all that we still have issues, the stock unit will get put back in.
Note, if you retain your stock amp, you will lose FADE control when installing aftermarket stereo. The only way around this is to bypass the stock amp (located in rear of vehicle) and run new wire from the head unit to all of the speakers.
07 WK CRD Limited