The COBB Tuning turbo downpipe is one of the first modifications most owners look to upgrade on their vehicle. By opening the diameter of exhaust flow coming out of the turbo, the COBB downpipe unleashes more power potential over the restrictive stock unit.

The COBB Tuning downpipe begins with a CAD designed bellmouth that directs the air coming out of the turbo. The design permits the air to flow with very little turbulence to the single high flow catalytic converter. This metal substrate cat is highly efficient, allowing the exhaust to flow much easier than the factory unit ever could. The COBB downpipe, combined with our AccessPORT engine management, is one of the most easy installations for any enthusiast looking to unlock the true potential of their STi.