I had dual QTP 2.5" on the Marauder (supercharged). It went from Long Tubes to Cutouts, to the Stock Front Cats, Rear Cats removed, then to the stock H-Pipe (modified to fit) then into the stock Mufflers and tips.
~30 RWHP/TQ was gained from what I recall in this application between being opened and closed.
:thumbup:
KillJoy