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The RS valve has a larger 50mm internal bore with a convenient top-adjustment for the spring preload
Diesel or E85
the drivetrain is constantly moving back and forth
New V3 Design:
PERRIN Master Cylinder Brace for 15-21 WRX/STi COP The RS valve has aThe PERRIN Master Cylinder Brace prevents unwanted movement of the master cylinder, allowing for increased brake pedal stiffness. Fits these Applications: 2015 2021 Subaru WRX 2015 2021 Subaru STi REDUCE FLEX Your brake pedal is connected to the thin sheet metal firewall which flexes as you apply the brakes. The firewall is not stiff enough to deal with the constant and repeated forces while applying the brakes. The PERRIN Master Cylinder Brace
US$ 161.67
US$ 71.98
US$ 71.98