Manley Extreme Duty exhaust valves are available in different sizes and listed by head diameter. Exhaust valves are sold as a set of 8. Fits 2002-2005 EJ205 Subaru WRX and 2004-2021 EJ257 Subaru STi. These valves are not compatible with the 2006+ WRX.
Vehicle Fitment:
EJ205 / EJ257
• 2002-2005 Subaru WRX
• 2004-2021 Subaru STi
(* Not for 2006+ WRX models *)
Purchase Includes:
• Set of 8 Valves
• Select Head Diameter Valve Size
Manley Extreme Duty Valves:
Made from a XH-432 Xtreme alloy, Manley Extreme Duty series performance steel valves are a great choice for supercharged, alcohol-burning, or high-revving engines. These engines generate a lot of heat and require special valves that can handle that kind of punishment. All valves are made from the best stainless steel available, with chrome stems and hardened valve tips. Extreme Duty series valves are swirl-polished and fully machined and available with either undercut heads or straight stems.
Install Note:
Manley strongly recommends that customers check their valve guide size in order to achieve the proper valve stem to guide clearance. Guides may need to be honed when replacing stock factory valves.
| Exhaust Valve Specs: | ||||||||
| Stem Diameter | Installed Height | O/A Length | Tip Length | Underhead Angle Radius | Margin | Seat Width | Top of Head | |
| 5.96mm/.2345″ | Stock | 104.75mm | 3.5mm | 25° x 11/32″ | .060″ | .100″ | 20° Dish | |
