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Message: [QUOTE="mikeeg02, post: 1410668, member: 24194"] I currently have this part number. M085171. I like it. Its quiet. What I notice is when loaded and 15-20 psi of boost, I get an annoying exhaust whistle. Similar to what the tuner cars did for a while with whistling tips and such. I'd be interested in seeing if you notice the same with that muffler. I believe what causes it in mine, is at the inlet they have an expansion section. Which then goes to the muffling section. Did yours have an open area before the muffler section ? I believe they do it to help with drone. EDIT: yours is a 5" mine is probably the 4" equivalent [/QUOTE]

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