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I've used GoodSpeed in Scottsdale for a bunch of work on my previous WRX. Haven't done much on the BMW yet but I know they have done some pretty amazing M3's and 5's. Top notch work in my personal experience.
Don't bother with Dynocomp and I didn't care for Vivid racing's customer service.
Not to sound like a fanboi for them but GoodSpeed is having a BMW car show this Saturday and you can check out their work. Prices are reasonable and they will spend time working out what you want and need.
I do go to the Pavillions and will be up for any Saturday usually. I think it would be cool to get a bunch of beemers together and get a bunch of spaces in the show. I did it years ago when I was involved in another car group. Was a blast.
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