Quote:
Originally Posted by chris3g
of course it drones a little dude, why do you think BMW puts 4 resonators and a ridiculously complex exhaust flap control scheme in the car from the factory? When you make these types of mods, there are trade-offs.
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This^ Typically way more noticeable with a valve controller. This is the first bmw I have had that doesn't allow fully open valves in stock configuration.