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I have a 2018 M240i convertible and have also recently fitted the harness. Very happy. All the best bits of the engine and exhaust sound remain, all the boomy resonant fake crap coming through the speakers is gone.
The car is more refined in everyday relaxed use. Even in comfort mode, it seems there was a little bit of drone through the speakers. That's gone.
Much quieter at slight throttle openings / low revs in Sport. Still sounds angry and brutal when you mash the pedal out of a junction/up a slip road though. Sports mode is now a mode you can use all the time, because it's only noisy when you want it to be.
And the audio system definitely sounds better. The hiss at low volumes is pretty much gone, but more importantly the harness seems to have removed a level of smearing that was there before. Difficult to articulate, but it's a bit like being back in the late 80s and listening to the original CD rather than a tape copy.
100% worth doing.
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