You may want to check out Maxspeed's new muffler. He re-designed the internals to get rid of the resonance. A PSE is the best solution, but the most expensive. I'd be willing to try it but every time I do someone else compliments me on the PSE so I hold off.
Chris
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1999 986 2.5L, Stock Exhaust (S muffler), EVO Intake, 18" Stock rims (17" during winter), IMS Upgrade, 150k+ miles and counting!
87 944S brought back to life
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