If you have surpassed the limits of your factory exhaust manifold, then it may be time to upgrade to the Invidia Equal Length Race Exhaust manifold. This is a direct replacement of the stock EJ Series exhaust manifold, and it has been designed to accommodate those looking to make more horsepower and torque. If you have switched to a full rotated kit, or if you simply want to make more horsepower and torque, then this header makes for an excellent upgrade.
This header has been fabricated from SUS 304 stainless steel and features Invidia's exclusive TIG welds with 3 layer tubing. There are CNC machined flanges to provide precision fitment upon installation.
A new uppipe gasket and hardware are provided to make this header ready for installation.
2004-2005 STI will require 06+ STI Oil Pan.
Note that some cars will require Subaru Oil Pan 11109AA151 for proper fitment.