If you don't have it already, maybe a more serious option would be looking at the MPE (M Performance Exhaust) gives the car a nice tone and will make it louder, the best thing about it is it keeps the warranty as it is a BMW Genuine part
I know it's not software, but it's worth looking into!
Well I think this is the first person wanting the "cold start" to be made even louder
Another cheaper alternative some of us do is to have the stock exhaust modified. Effective is almost like the MPE (not quite the same of course), but very good for the money. Think it's around 2-300 to have it opened up, modded and then welded shut again.
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