535is that is in need of audio help. Currently there is just a factory cassette. I have some equipment from my last car I had planned to use but I'm running into some problems. I have a pair of Infiniti Kappa 4" separates that I wanted to use in the front kick panels/tweeter pods, but the magnets are too large to fit in the factory location. I have an Alpine 4x60W amp that can run in a 4,3, or 2 channel configuration, and an Alpine CD head unit for the dash, a pair of 6 1/2" separates for the parcel shelf, and a 10" Rockford/Fosgate sub in a sealed enclosure. My plan was to use the amp in a 4 channel setup, running the 4" separates in the front and the 6 1/2s in the rear, then maybe buy a 1 channel Alpine sub amp. I have a bad feeling the 6 1/2s won't fit in the rear either, although I could make a spacer. I am going to cut a hole in the metal wall behind the rear armrest for the sub, but would prefer to keep all cutting to a minimum if possible. What are your thoughts on the best setup using what I already have, or buying a very few new items...? Thanks in advance.........