The Borla Hush Twin-Tip Catback Exhaust for the WRX and STI features 3in piping with a resonator and quiet twin-tip muffler. This is an exceptionally quiet exhaust for the WRX & STI. The section of the catback that bolts to the downpipe is slip-fit, and can be replaced with the 3in adapter for future upgradability. The downpipe section Borla includes will bolt perfectly to your stock downpipe, but the optional 3in adapter simply bolts on and removes the bottle neck if you plan to use a 3in downpipe. Backed by Borla's million mile warranty, and constructed of stainless steel -- this is an excellent choice for your WRX or STI.
Much quieter than the Cobb catback at idle, but is nearly as loud at WOT. Just what I was looking to achieve. Great quality and very easy to mount and align. I did need to purchase longer hangers to get it to clear everything.
Installed on my 2005 Forester XT and I love the sound. It's loud enough without being obnoxious. I'm not a fan of the angry bee sound most exhausts have. Installation on a Forester requires long exhaust hangers, but it does *not* require the 3" adapter.