This is a universal axelback muffler ... Not a specific TSX designed full or catback exhaust system. I doubt there's much gains to be had except perhaps weight reduction on the 2 OEM replacement mufflers.
If that is the case, i know skunk2 is builiding one specific for the TSX plus on the other forum someone said skunk2 is buildiign a complete project TSX for Sport Compact Car.
TSX Club is the perfect forum for Acura TSX fans and Owners, where you can discuss concerns about reliability or how to upgrade your TSX with mods and accessories.