Amusingly I ran #12 on my car for a bit. It had low end and top end but the middle range was dead.
(this document was from the development process of the Borla V2 mid, and the "custom" pipe listed up there in #12 became the borla V2)
The race mids for the 46 M3 do prove they can be "too free flowing", though. They get you to ~320-330 whp, but completely destroy the bottom/middle end. Said first hand, as I have it on my race car.
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2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport
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