Kartboy Diff Wedgelock Kit Subaru WRX / STI 2015-2021 | KB-003-Wedge Vehicle Make_Volkswagen and they will tell you

and they will tell you that the best bang for the buck handling mod you can give your Legacy GT is a high-performance sway bar

and the ultimate sound when compared to comparably priced systems

Auto Meter pods are installed over your current factory a-pillar and are held into place by a few plastic pins inserted into hole you drill in the stock a-pillar

Programmable boost cut based on AFR safety thresholds

Kartboy Diff Wedgelock Kit Subaru WRX / STI 2015-2021 | KB-003-Wedge Vehicle Make_Volkswagen and they will tell youFitment Information: 2015 2021 Subaru WRX 2015 2021 Subaru STI Features: The Kartboy Wedgelock Kit consists of two rear diff bushings with CNC machined aluminum inserts that "wedge lock" the rear differential. Along with four inserts for the rear subframe. All in Stealth Black. Easy install with hand tools.