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Manley Performance MAN Extreme Duty Valves - Manley 00-03 Subaru WRX (EJ20) / 04 STi Exhaust 33mm Stainless
Part #: 11139-8
$548.34 For each
Fits On:
2005 Subaru Impreza, 2007 Subaru Impreza, 2006 Subaru Impreza, 2004 Subaru Impreza, 2003 Subaru Impreza, 2002 Subaru Impreza, ... See more
Description:
Manley Performance's Extreme Duty exhaust valves are 33mm stainless units built for the 00-03 Subaru WRX (EJ20) and 04 STi. Designed for high-stress applications, these valves are a direct fit for builds pushing well beyond stock power levels.
Manley Performance's Extreme Duty exhaust valves are 33mm stainless units built for the 00-03 Subaru WRX (EJ20) and 04 STi. Designed for high-stress applications, these valves are a direct fit for builds pushing well beyond stock power levels.
Q: What are valves? Why buy valves?
A: Valves are used to let a mixture of air and fuel into a cylinder and allow exhaust gases to get out. Each cylinder has at least two valves each, multi-valve engines have more, often four per cylinder. Upgraded head valves are able to withstand more heat from nitrous oxide use and turbo/supercharger use, so it's an excellent upgrade for people looking for added compression without sacrificing any reliability.
Q: How do you install valves?
A: Valves require headwork and should be left to the pros. While replacing valves, valve guides, retainers, valve springs and camshafts should all be considered for upgrades at the same time.
A: Valves are used to let a mixture of air and fuel into a cylinder and allow exhaust gases to get out. Each cylinder has at least two valves each, multi-valve engines have more, often four per cylinder. Upgraded head valves are able to withstand more heat from nitrous oxide use and turbo/supercharger use, so it's an excellent upgrade for people looking for added compression without sacrificing any reliability.
Q: How do you install valves?
A: Valves require headwork and should be left to the pros. While replacing valves, valve guides, retainers, valve springs and camshafts should all be considered for upgrades at the same time.
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