HKS Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit 2008-2021 STI YMM_2018_Crosstrek The intake tube’s diameter and

The intake tube’s diameter and airflow straightener are calibrated to maintain accurate MAF sensor readings

Using a FARO Arm and 3D CAD software

These premium billet camshafts deliver quicker turbo spool and increased torque across the entire RPM range

low-profile design that enhances your vehicle’s exterior without overpowering it

HKS Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit 2008-2021 STI YMM_2018_Crosstrek The intake tube’s diameter andHere, you are looking at the HKS SQV4 Black Edition Blow Off Valve w Return Kit for the 2008 2021 STI. In 1994, HKS introduced the first Sequential Blow Off Valve featuring a unique, pull type, sequential valve structure and a differential pressure control system. This advanced pull type relief system allowed for stable operating ranges from low to high boost pressures. Since imitation is the highest form of flattery, HKS has once again redesigned the