GSC Power-Division Beehive Valve Spring Kit for FA20 WRX-BRZ-FRS EJ20 Shortblocks The V4 is a thicker

The V4 is a thicker insert than the V3 version and is recommended with 800 WHP or higher builds

3X OEM oil pickup tube thickness and a brace between bracket and oil pickup tube to further strengthen the assembly

The disc is generally smaller and thinner than the OEM disc making for lower inertia and therefore quicker

besides the obvious

GSC Power-Division Beehive Valve Spring Kit for FA20 WRX-BRZ-FRS EJ20 Shortblocks The V4 is a thickerMax 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