Torque Solution 06-21 Subaru STI EJ Big Bore Manifold Big Bore 76mm Throttle Body Adapter - Black | TS-SU-870P-BK Ralliart_2009-2017 The stock fuel rails are

The stock fuel rails are fine for lower power levels but as horsepower increases

Allows for an easy press installation of the EJ251/253 SOHC

providing quiet operation with less chatter

shorter stopping distances

Subaru part number: 15255AA100

Torque Solution 06-21 Subaru STI EJ Big Bore Manifold Big Bore 76mm Throttle Body Adapter - Black | TS-SU-870P-BK Ralliart_2009-2017 The stock fuel rails areProduct Fitment: Subaru STI 2004 2005 (Requires 2006+ riveted throttle body) Subaru STI 2006 2021 Subaru WRX 2006 2007 Subaru WRX 2008 2014 (must swap to a confirmed fit intake manifold) Subaru Forester XT 2004 2008 Torque Solution Big Bore 76mm Throttle Body Adapter for Subaru EJ engines using a big bore intake manifold. Our adapter allows you to swap to a Toyota 76mm big bore throttle body which provides a 25% increase in size over OEM. Made from