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      08-28-2013, 01:34 AM   #23
jksgoh
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Drives: M2
Join Date: Oct 2008
Location: Melb, Vic, Aus

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2008 E82 125i  [0.00]
Quote:
Originally Posted by VGR00 View Post
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.
you can look under the car and see if it has the rubber piece quite easily.

Not sold on this J pipe idea, but would be good to hear how you find it.

BTW, you're obviously not happy with the PE ?
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