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Some options.
1) Remove the middle resonator and replace it with a straight pipe. Cheap and should give you alittle more sound
2) You can also have a shop cut open the stock muffler and remove some of the materials inside to make it more free flowing and more sound. M3 guys do it all the time.
3) Have a muffler shop weld up two aftermarket mufflers to you car. With the muffler/tips and labor it should be less than 1K depending on the shop.
It all depends how loud you want to go. The F10 is extremely well insulated so its going take a pretty loud exhaust for you really hear it.
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