As much as some of us hate to admit it, we love the sound of a blow off valve (BOV). Something about the sound of excess pressurized air escaping from a valve annoucning to the world that a power snail (AKA turbo) under the hood gets me going. If you have the HKS Super Sequential Blow Off Valve (SSQV) you can adjust the sound with these inserts. The gold tripple fin will give a higher frequency sound while the purple provides a low frequency pitch.
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