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could it be the waste gate not functioning properly...u said you experience at high rpms...that pfffft sound may be you dumping some boost pressure...its just a thought someone else should chime in with a way to check that...
Let's say it is the exhaust flutter from the straight muffler. And let's say I (I mean HE) did not like that flutter sound. What kind of muffler would he replace it with?
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