FYI, I took the plunge tonight and flashed Bootmod3 to my new-to-me 540xi M-Sport. Part of me thought I was crazy, since the stock B58 already pulls harder than any stock engine I’ve ever had. But I’ve heard so much goodness about this tune and the potential it unleashes in the B58. So I went ahead and flashed the 91 octane stage 1 tune and....OMG!! My first trip around the block I actually giggled. This thing pulls like there’s no tomorrow but also seems smooth as silk considering the gobs of power it’s delivering. Can’t wait to put it through its paces in more depth tomorrow.
I’d love to hear experiences of any other BM3 users out there. I’m pretty excited about this thing.