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Originally Posted by DanG
You can't tell the difference with the windows up. I stuck with stock.
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From my research so far that's the general consensus of the m performance exhaust or any axel back exhaust.
The thing is the bmw actually have great sound insulation. As if you take a video from the outside, the stock exhaust actually sounds decent. The m performance axel back exhaust only enhances it a little.
For good but not over the top sound and if you don't want drone? You'd have to go non-resonated cat-back.
And for an extra oomph you'll have to go sports-cat.
And for over the top you'll have to go catless. But you'll bound to get drone.
This is the way I see it through my research