Manley Exhaust Valves 32mm OEM Size Extreme Duty 2002-2014 WRX / 2004-2021 Subaru STI | 11137-8 EVO_2003-2004 No need to worry about

No need to worry about a retune or anything else

(0-2200° F includes K-type Sender

This AEM kit allows the user to safely run higher boost pressures and suppress detonation allowing the utilization of more timing and boost

Estimated Installation Time - 10 Minutes

and have reduced street drivability

Manley Exhaust Valves 32mm OEM Size Extreme Duty 2002-2014 WRX / 2004-2021 Subaru STI | 11137-8 EVO_2003-2004 No need to worry aboutManley Performance has been manufacturing the finest stainless steel valves for over 40 years. Manley valves have been the standard of the industry from their inception, a fact that still remains true as they shift their focus and resources to the Sport Compact Market. The Manley Stainless Race Valves feature chrome stems, hard tips, fully machined surfaces and swirl polishing under their heads. These valves are available in both stock and oversized,