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You need to stop making new threads and search or just lurk around reading. These questions you're asking are very basic fundamentals to turbocharging. This one is straight opinionated.
If u rout is back to the intake then it stayd quiet, your engine muffles it. If u run it open its realy loud, if it runs back to the exhaust it will make the exhaust louder
by far the best is to rout back in to the manifold that way its quite and gets rid of turbo lag
just make sure its angeled away from the head so you dont get so much back pressure