Quote:
Originally Posted by SL3000gt
NGK is a spark plug brand, a Greddy Type S BOV (blow off valve) is an aftermarket BOV that releases pressure between shifts in order to preserve your turbos in short. It generally makes a whistle/fluttering sound depending on how much boost you are pushing between shifts. You have a stock BOV that is quiet but it is notorious for leaking boost especially when trying to hold more than stock boost beit 9 or 12 psi.
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He doesnt have ANY BOV because he is NA.