The Forester XT Exhaust uses TurboXS' 3 inch from the front flange all the way to their Staight through design muffler with a 3.5 inch tip. This is hands the the best sounding exhaust for the Forester XT and to top it all off it doesn't reduce down to 2.5 inches anywhere unlike some of the other exhaust systems. You should see a 10-12 whp gain with this catback without a problem.
All hardware is included to make this 100% bolt-on in your driveway
*Pictures used for marketing purposes only, actual product may vary