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Depending on the boost level, it doesnt really get too loud. Alot of people dont route their pipe back to the exhaust pipe. I like mine open because it is less resistant. When you start increasing boost, you'd want the wastegate release the flow sooner.... actually that applies to any boost level. It's just more advisable to higher boost level. Some people also pipe it with the exhaust to pass inspection. The things is, to do that, it must be pipe prior to the cat-converter. Let me know bro....
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