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Just bringing up this old thread as it discusses some droning under acceleration around 2500rpm. I notice this as well. I don't know if my original exhaust had that rubber piece and was transferred over as I had an exhaust shop put in the Performance Exhaust.
I went back to the exhaust shop today and they are telling me to add a "J" pipe to eliminate Helmholtz resonance. I've done some research and it looks like there is a lot of success with other car communities with this. I'm going to get it done tomorrow but just putting this out there and it would be good to hear if anyone has done this and achieved success.
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