I know all about those mufflers. Got them on my 9 second camaro with an x pipe and love them. Very quiet street driving. Can have a conversation in the car without yelling. Catch many people off guard when i open the cutouts too haha.
Keeping the magnaflow cat though. Want to stay emissions legal at least with the visual check. Not to mention it is high flow 3" bullet with metallic core that I am sure flows fine.