GSC FA20 WRX Exhaust Valves Select::STD 29mm Single Valve (GSC2281-01) The reason the S cover

The reason the S cover performs so much better is that they have a much larger diffuser area

82 10504006149 S Cover Ported V-Band T3 Inlet (Stainless Housing) V-Band T3 Outlet (Stainless Housing)

If you take all the factory pieces you remove and compare them to the PERRIN parts you are installing

Notes Stage 1 Organic Clutch Clamp Load 3597 Disc Diameter (Inches) 9

Available for Subaru WRX

GSC FA20 WRX Exhaust Valves Select::STD 29mm Single Valve (GSC2281-01) The reason the S coverGSC Power Division exhaust valves for the FA20 2015 2021 WRX models. Exhaust valves are sold as a set of 8 or individually as needed. Available in the standard 29mm size or +1mm. Valve stem diameter is 5. 5mm, overall length is 97. 90mm. Vehicle Fitment: Subaru FA20F 2015 2021 Subaru WRX GSC Exhaust Valves: Part Number: Head Diameter Size: Material: Quantity: GSC 2281 8 STD Size (29mm) 23 8N Stainless Set of 8 GSC 2281 01 STD Size (29mm) 23 8N