An external wastegate on your 2015 STI is superior to any internal wastegate setup and will hold boost rock solid. External wastegates allow for quicker spool because they do not cause turbulance in the exhaust stream and also give better boost control. Typically an external wastegate setup can free up 10-40hp depending on your setup. The uppipe uses 14 layer 304 stainless steel and a triple ...

An external wastegate on your 2015 STI is superior to any internal wastegate setup and will hold boost rock solid. External wastegates allow for quicker spool because they do not cause turbulance in the exhaust stream and also give better boost control. Typically an external wastegate setup can free up 10-40hp depending on your setup. The uppipe uses 14 layer 304 stainless steel and a triple ...

An external wastegate on your 2015 STI is superior to any internal wastegate setup and will hold boost rock solid. External wastegates allow for quicker spool because they do not cause turbulance in the exhaust stream and also give better boost control. Typically an external wastegate setup can free up 10-40hp depending on your setup. The uppipe uses 14 layer 304 stainless steel and a triple ...

The TurboXS WRXAnd STI external wastegate uppipe allows you to run an external style wastegate to any stock or stock location turbocharger, allowing for rock solid boost control on high boost setups. The TurboXS uppipe is spefcificially flanged for a Tial 44mm v-band external wastegate (not included) or equivalent, and includes an external dump tube that is a direct exit into the atmosphere when ...