Cobb Stainless Steel Hi Flow up pipe. This pipe replacing the factory STI Up pipe. The factory STI Pipe necks down to 1.5 inches inside. The entire engine runs through this 1.5 inch pipe, and that restricts power.

The Cobb pipe typically adds 15 WHP across the power band and up to 20 WHP at redline! One of the most overlooked modifications you can do to your STI!