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Ultra 310 Bypass Valve/Blow Off Valve

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  • Ultra 310 Bypass Valve/Blow Off Valve

    Hey guys
    Fitted a dual port aftermarket BOV/Bypass valve (the one with the vac hose going to it) It was not the HKS one I've seen people previously install. It now misses, surges and cuts out around 4000rpm - If I go wide open throttle it will rev past this point and run fine but as soon as I try to cruise around that 3500-4000rpm point it will bog down and turn off entirely. Just curious if anyone else has come across this issue and if anyone has any info about the differences between the factory BOV/aftermarket BOV that would cause this issue.

  • #2
    It might need a different color spring for pressure adjustment.

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