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EMISSIONSThis part is not an emissions-related part and therefore can be used on Emission Controlled Vehicles.DESCRIPTIONThis LF BPV Rebuild Kit is a package of hardware and o-rings required to completely rebuild the current COBB LF Bypass Valve. New o-rings, assembly lube, hardware and tools give you everything necessary to address concerns with a COBB LF BPV that may not seal as well as it used to.In August of 2020, the LF Bypass Valve for the 2015-2020 WRX and 2014-2018 Forester XT was updated with a new internal spring. The Rebuild Kit will include both springs, please choose the option that is appropriate for your application.Original Spring (uncoated)Free length: 3.5"Rate: 7.4 lbf/inBench cracking vacuum installed in LF BPV: -5.7 psiNew Spring (yellow)Free length: 2.25"Rate: 40.5 lbf/inBench cracking vacuum installed in LF BPV: -6.7 psiWHY?Over time the o-rings within the COBB LF Bypass Valve may potentially deform or fail. This rebuild kit provides all parts needed to completely rebuild any of the current LF Bypass Valves.FEATURESLF Bypass Valve Rebuild Kit V2