Tapered Up-Pipe.
(All WRX and STi)
Turbine Inlet Pipe Assembly - Std/Std. Manifold.
This APS Up-Pipe is a complete bolt-on assembly including cast-iron up-pipe and a truly innovative double wall 321 stainless steel flex coupling that incorporates an internally tapered profile that ensures optimum exhaust gas speed which in turn transfers the greatest amount of thermal energy to the turbocharger for even greater horsepower and crisp throttle response.