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Hi, I am looking for some help from any acoustic experts out there. My 71 GTV car has a 2.0 with an Eaton M62 supercharger. It all works pretty well. I am happy except for a loud howling noise at about 4,000 RPM. Since the stock car did not make this noise it must be something I added. I am suspicious of a plenum I made to go from the throttle to the supercharger intake. It is located just forward of the brake MC. I suspect the shape or the large flat surfaces may be causing the noise. Could this be the culprit? How can i quiet it down?

Thanks, Trav
 

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