It truly is the lack of sound entering the cabin- not the sound on the outside so I wouldn't say it needs an exhaust upgrade. For many that buy this car it serves dual purpose, sporty and yet sophisticated enough to transport colleagues and business associates. Not to mention not everyone wants to hear a very loud exhaust daily.
But once again- it sounds great at WOT from the outside so I don't see that as BMW making the exhaust too tame.
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