Agency Power does it again with their catback system for the WRX/STI. This system features full 3" stainless steel polished piping that exits through their fully titanium race muffler. It is completely TIG welded for added strength and durability. Agency Power has seen a 12whp gain typically with this catback and it will bolt up to a stock downpipe or aftermarket downpipe with no issue. Included is all hardware and gaskets for installation.
The catback exhaust will fit to the factory downpipe or aftermarket downpipes/headers. The exhaust has an angled exit as seen in the pictures for that JDM look. The race sound of the exhaust will not drone inside the car but give you that quality tone you desire.Note: Are you using a stock j pipe or downpipe? If yes, the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046, is required.