Tri-Y Exhaust Manifold

The "Tri Y" design features 1.75-inch primary runners, which significantly improve exhaust gas velocity to the turbocharger, resulting in improved low-end torque and quicker boost response. To manage the thermal expansion of stainless steel and prevent cracking, double-layer slip joints are integrated into the design, ensuring a leak-free movement. The headers include a 40mm external wastegate port option for finer boost control on OEM or larger turbo applications. The main up-pipe tube and wastegate tube are constructed from robust 1/8-inch thick stainless steel. For (08+) models, an aluminum skid plate is included to replace or protect the OEM belly pan from melting. A side plate is also provided to shield the air/fuel sensor (oxygen sensor), and a VVT solenoid heat shield protects the right-side exhaust VVT solenoid. This part requires custom ECU tuning for proper operation. This component is compatible with Subaru WRX models from 2002-2014 and WRX STi models from 2004-2021.