OK so I have decided to get a wiring harness to provide me better access to the factory speaker wiring (only using it for the front doors) but I am worried about buying some I've seen that are listed as NOT R.A.P compatible. I just want to make sure that with my aftermarket HU I will still be able to listen to my stereo with the ignition turned off (and doors closed).

Do aftermarket wiring harnesses prevent this and if so do they make one that I can use and retain this great functionality?

Thanks