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Originally Posted by AndDown
We went from a 2013 328i to a 2016 428i GC and anecdotally, the GC has better noise reduction. There seems to be less road and wind noise with the GC, plus when shutting the doors, there is a more solid "thunk" over the previous F30. The GC also has less of a "diesel" sound both outside as well as in the car which could be attributed to better insulation plus a possible upgrade to the turbo. 
Anyhow, I like what they've done with the F36 GC. |
The turbo is definitely identical. Insulation could be different. During a test drive before I got my 340 I drove a 435 Gran Coupe with the M performance exhaust. It was pretty quiet. Immediately starting the 340 the exhaust was much louder. Either way for the OP I feel the type of tire is causing the road noise.