The Invidia Divorced Wastegate Down-Pipe replaces the two factory catalysts with a single high-flow catalyst, and a much less restrictive design. This allows your Subaru to make more power with the stock turbo, and this is an absolute must if you are going to be putting on a larger turbo.
Gaskets are sold separately, and this down-pipe has a 3flat flange, allowing it to attach perfectly to most 3" Cat-Backs.
Invidia has a reputation for manufacturing high quality exhaust systems with an excellent reputation for ease of fitting and increased performance at a very competitive price. The quality of their products rival many more expensive rivals. Invidia cat-back exhaust systems regularly receive glowing reviews on Amazon.com and other automotive internet forums.