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      10-26-2012, 11:27 PM   #65
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Drives: AW F10 550i
Join Date: Aug 2012
Location: SoCal

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Do you suspect there will be drone by replacing the muffles with those from a f10 m5 while keeping everything else stock?

Thanks for taking the time and sharing all the pics and videos. Great work.

Originally Posted by Edman951 View Post
FYI, did another test on Friday.
i figured i should try all the possible combo's with my setup to find the sweet spot, and reduce the drone with out any parts.
So here is my conclusion.

-Stock center resonator (x-pipe) with my vibrant muffler = drone from 1300-2000rpm. But sound great.
- My X-pipe with with my vibrant muffler = same drone as above. from 1300-2000rpm. But sound even beter then with the stock center resonator.
-My x-pipe with factory mufflers = no drone, a bit of sound, but needs a bit more for my taste.

So to reduce drone, i will need to tap in to the line and add a resonance chamber. Like Active Autowerk does on the E9X M3 exhaust system.
Or maybe i will try this muffler from Dynomax. Looks interesting.