I e-mailed Dynomax after someone on another thread indicated that the April 2005 issue of Car Craft magazine has a new product listing of a cat-back for the 300C. I recieved a reply from Dynamax that NAPA , Summit and Jegs will carry the part. I just talked to Summit who did some research and indicated the cost would be $512.39 plus a $8.95 handling charge and would be a special order. Unfortunately I don't have information on the system or what is sounds like! This is a good option however, as Dynomax has a good product line.