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

Available for Subaru WRX

you'll want to look into the Clutch Masters Twin Disc

Rotors: Part Number: Front Pair D1-047 Rear Pair D2-047

340LPH (90 gph) at 73 PSI

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