I had my mechanic who installed the SC use the car for the morning. He verified that the noise is in the SC. Reported that it sounds like a bag of marbles and the noise in random but most noticable under load. He set the parking brake and manipulated the throttle in order to get a good listen. I've been trying to talk with someone at Alpine. Can't wait to get it fixed. BTW, I thought it was an exhaust noise too.