The results of our analysis leads us to three different types of possible bypass valves:

1- The Sound Performance Boost Activated exhaust cutout  ( or a similar custom unit using a Wastegate Actuator Choosing a bypass valve for your twincharged application and a spare throttle body)

2- The HKS Twinchamber Racing Bypass Valve, or the Greddy Type-S BOV

3- A 60mm external wastegate Choosing a bypass valve for your twincharged application with a large enough ID for good intake airflow


Illustrations:


Home made butterfly bypass valve