for the cool sound, then you aren't using them properly.you want as little noise as possible. that is the purpose of a blow off valve. you can also buy the ones from HKS and remove the sound rings too. so that they aren't nearly as loud (and annoying) as stock HKS bovs. I removed whistle makers entirely. please. All I ask is that you understand what their design intent is, and pretend that it is what you are using them for.
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