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My FMS 65mm TB (just installed) whistles too. I reused the OEM gasket (couldn't find one in town and didn't want to wait for shipping) so I'm wondering if this could be the problem since I everyone says the FMS doesn't whistle. I made a new gasket myself but didn't install it since the OEM gasket didn't break. I'll try that but doubt it's the problem. Any ideas guys?
 

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The OEM gasket matched up perfectly with the 65mm TB so I assumed there wasn't any restriction or lip of any sort. However, that do I know. It is a stock upper so maybe I need a little port job? Just around the edge maybe to tapper it?
 
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