I am running no res and Erace Muffs.
It is loud and drones a ton 1600-2000 RPM, which is like 90% of my city driving.
But depends what your comfort limit is. I tend to run a lower gear to keep the revs about 2,100, then it is a sweet o' sound.
try it, it is not a big deal to re-install the resonators.
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2014 ///M5 CP Tanzanite Blue/Cohiba - 11.15 @ 128.8 & 1.84 60' (2150' DA) - BPM Tune - MSR Intake - SSP DCT - SS DPs & HFC Mid Pipes/X-Over - E Race Muffs - 19" MT DRs... On to a new home.
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