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For anyone on the fence about the MPE worried it might be too loud or aggressive, don't be. Like stated above, the one caveat is on cold start due to the way the induction and exhaust valvetrain are timed. Once passed, the sound is just straight up exotic + quality.
Know this, as it may be a matter of preference: the tone of the MPE is generally higher in pitch and smoother than say, an M550i with exhaust which turns into more of a muscle car sound. You will NOT get the deep and guttural V8 rumble from the MPE on the F90. It'll sound more like a flat-plane V8, to be honest. I happen to prefer the tone, but YMMV.
Oh, also there is zero drone despite no longer being a valved system. The "exhaust sound" button no longer raises or lowers the exterior volume, but it does add in the pops and bangs. Any perceived increase in sound in the exhaust sound "on" mode is actually just in the interior - it's ASD programming only.
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