The addition of a performance uppipe is a favorite modification among die-hard Subaru tuners around the globe. Invidia's Subaru WRX uppipe is a catless direct bolt on replacement for the factory uppipe in your 08-14 WRX & STi. Removing your WRX's restrictive factory uppipe increases exhaust flow to the turbocharger and in return improves turbo spool, throttle response and power output. The Invidia uppipe has a bung for an EGT sensor, but can easily be plugged when used on the 08-10 WRX, which do not have an EGT sensor in the uppipe (plug not included). The Invidia uppipe includes replacement studs for added installation convenience. Though the 08-14 WRX & STi do not have a cat in the factory uppipe like older models, this product will still improve throttle response and drivability.