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the Manley Performance Extreme Duty Stainless Steel Valves are a premium upgrade for 2002-2005 WRX and 2004-2014 STI models
The latest in material formulation technology boasts resistance to oil
Verify Compatibility: Confirm fitment for your specific year and hood type
Full aluminum construction with TIG-welded polished end tanks
engineered for enthusiasts who demand both performance and daily comfort
IAG Performance / ARP 14mm Head Stud Set Most Subaru Models YMM_2016_WRX the Manley Performance Extreme DutyThe IAG ARP 14mm Head Stud Set is engineered specifically for high horsepower Subaru EJ engines where extreme cylinder pressures demand maximum clamping force. By increasing the stud diameter to 14mm, this system significantly improves load capacity, helping prevent cylinder head lift and the head gasket failures commonly associated with high boost applications. Compared to standard size head studs, the oversized 14mm design delivers superior strength
