[Aus335iguy]

ACC is possible on an M3 however and what I've learned about it so far is that the M3 and 6 cyl DSC modules are the same electrically and so you can flash the DSC with any other DSC from any other post 2007 6cyl model.
The problem with using ACC on M3 is that M3s have other features such as M drive and M dynamic mode which were not ever delivered in conjunction with ACC natively
The problem isn't getting ACC working on an M3 as that's just a case of flashing and you're done. The problem is retaining these other features while adding ACC.
The only way that I've heard of it being done is via nettodat manipulation but people have tried but but can't replicate this successfully
In addition the M3 KOMBI doesn't have some of the leds for active cruise and will need to be soldered in.