Are the cats still in place?
Yes. Pypes 3" x pipe, into custom made 3" mid pipes, into GT500 mufflers. No drone at all, and not any louder than stock when in 6th gear on the freeway under 80mph. When you get on it, it's pretty loud. Literally, once a day, without fail, someone either gives me a thumbs up or comments on the car/exhaust.