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I have the MPE exhaust and the MPPK fitted to my 435i convertible. It sounds amazing compared to stock - a nice exhaust note in comfort that won’t offend the neighbours, and then a much deeper and louder experience in Sport. When in sport mode you also get loads of crackles and pops on the over run or when changing down gears. My understanding is that the MPPK remap and filter box adds to the crackles.
Absolutely no motorway drone in any of the modes. Mine has done around 1000 miles so I expect the noise to improve over time.
It’s not a cheap mod, but in my opinion unlocks the best compromise of sound and refinement from the car.
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