GSC Power-Division Beehive Valve Spring Kit for FA20 WRX-BRZ-FRS Breather Plumbing and Fittings less than 1% variance from

less than 1% variance from the longest to the shortest

This means that it is suitable for turbo or supercharged applications running up to 3

These will never be the bottleneck in your fuel system

One of the first things to note about the OE exhaust manifold are the several points where flow is decreased due to a neckdown in piping diameter

8L AT 2WD LS Sedan 1993

GSC Power-Division Beehive Valve Spring Kit for FA20 WRX-BRZ-FRS Breather Plumbing and Fittings less than 1% variance fromMax RPM: 9,500 RPM Max boost: 35 psi Beehive Spring Coil Bind 0. 800 Install Height 1. 308 1. 315 Seat Pressure 89 87 lbs Open Pressure @ 11mm lift 231 lbs @ 0. 875" 229 lbs @ 0. 882" Maximum Valve Lift 0. 448 Includes: 16 Dual Springs 16 Spring Seat Locators 16 Titanium Retainers Beehive Spring Benefits: Rev faster Lighter components More durable design Less stress on valve train components Lower spring frequency for more precise valve control More