Just put a Thermal R & D cat back on my type S. Pretty loud , but deep and throaty. Nice race car sound. {Coming from a Mustang Cobra, I've always hated the "lawn mower" sound most imports make}. It seems to have added a bit more punch to the car. I also have the Injen intake with a Ractive filter. Just replaced all the fluids with synthetics and Prolong as well. Can't wait to get the car on an entrance ramp to the expressway and wind it up. ............Russtang, blue type s