HKS not all the HKS are made like "NI" racing exhaust and the Apexi GT (the GT's are loud but they both are made for silencers). to be honest, depending on the size turbo, it's still going to make the "hey i have a turbo" sound. A friend of mine hase a 2001 Audi A4 turbo and when he takes off you hear turbo and his cars is all stcok.
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