Description
The design and processes on these dual valve springs are optimized to reduce valvetrain harmonics and provide greater stability on high horsepower applications. We use high grade premium super-clean PAC alloy materials and maintain tight tolerances for those unique aftermarket cylinder heads.
Type/Material/Application: Dual Spring - Special Alloy - Turbo - Endurance Racing
Outside Diameter: 20.8 mm/28 mm
Inside Diameter: 16.51 mm/20.8 mm
Seat Pressure: 80 lbs @ 36 mm
Open Pressure: 180 lbs @ 26 mm
Rate Inch: 254 lbs
Coil Bind: 21.0
Max Net Lift: 14 mm
This Spring requires Ferrea Titanium Retainer # E11065 and Ferrea Spring Seat Locator # SL1051 (Discard OEM Spring Seat Locator)
Fitment:
2004:Subaru:Impreza:WRX STI,
2005:Subaru:Impreza:WRX STI,
2006:Subaru:Impreza:WRX STI,
2007:Subaru:Impreza:WRX STI,
2007:Subaru:Impreza:WRX STI Limited,
2008:Subaru:Impreza:WRX STI,
2009:Subaru:Impreza:WRX STI,
2010:Subaru:Impreza:WRX STI,
2010:Subaru:Impreza:WRX STI Special Edition,
2011:Subaru:Impreza:WRX STI,
2011:Subaru:Impreza:WRX STI Limited,
2012:Subaru:Impreza:WRX STI,
2012:Subaru:Impreza:WRX STI Limited,
2013:Subaru:Impreza:WRX STI,
2013:Subaru:Impreza:WRX STI Limited,
2014:Subaru:Impreza:WRX STI,
2014:Subaru:Impreza:WRX STI Limited,
2015:Subaru:WRX STI:Base,
2015:Subaru:WRX STI:Launch Edition,
2015:Subaru:WRX STI:Limited,
2016:Subaru:WRX STI:Base,
2016:Subaru:WRX STI:Limited,
2016:Subaru:WRX STI:Series.HyperBlue,
2017:Subaru:WRX STI:Base,
2017:Subaru:WRX STI:Limited,
2018:Subaru:WRX STI:Base,
2018:Subaru:WRX STI:Limited,
2018:Subaru:WRX STI:Type RA,
2019:Subaru:WRX STI:Base,
2019:Subaru:WRX STI:Limited,
2019:Subaru:WRX STI:S209,
2020:Subaru:WRX STI:Base,
2020:Subaru:WRX STI:Limited,
2021:Subaru:WRX STI:Base,
2021:Subaru:WRX STI:Limited,
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