First off, i know that you need to retain the stock radio to keep sync and some other functionality, and I have a JL audio cleansweep processor left over from a previous car. for those not in the know, its a digital sound processor that takes speaker level input, uses a crossover to clear out any internal radio processing, and then outputs a full frequency spectrum through front and rear RCA outputs. my questions are: does the factory radio have a traditional speaker level output going to any factory amps? i would assume so. what size are the factory speakers (front/rear)? is there enough room under the front seats (assuming SEL model with both front seats powered) to fit small amps? I ask all fo these questions as I have not taken delivery yet of the car, and when I do, it will be my company car, with no spare room in the trunk.