It all started with "Snorkus Ectomy," or removing the stock Subaru intake. It was restrictive, and could be improved appon. I started this project by replacing the Gen. 2 EJ22 intake, with the intake from a '93 Subaru Legacy. I also added a K&N cylinderical filter.
Custom Cat. Back Exhaust
For the exhaust, I added a custom made Cat. back exhaust using 2.25" stainless steel, mandrel bent, with a polished stainless steel Magnaflow 14822 cylinderical muffler. It sounds nice and deep, with enough just enough sound. (OK, it is REALLY loud when pressed!!)