I really don't want to add any new speakers to mine - other than the existing radio console. I also plan to listen to the exhaust a lot. That being said, I'm wondering if I could use a small "combination" speaker (6X9 / tweeters built in - or whatever) a switch, a very small amp, and an ipod jack. In the glove compartment, I'm imagining the plug, the amp and a switch between "radio to speakers" and "amp to speakers." To my mind it would be very unobtrusive, easily reversable and easy to fabricate. Those are pluses enough to somewhat compromise sound quality