[CrzyChris5]

So I had the pleasure of hanging out with my friend Rob, (FSociety), frequent visitor here and we took our X4M40i's out for a few runs recently to compare the BM3 vs MHD on the same car. There are really no direct comparisons out there so we were curious.

His car was FBO with BM3 flash tune and my car only has downpipes, No FMIC yet and i have the MHD stage 2+ flash. Both running on 93 octane. Temps outside i believe were in the 60s or low 70s.

These were very informal runs as we had to deal with a lot of traffic so we managed to run from about 50 mph to about 120 mph runs. First 3-4 runs he was pulling on me about 1 to 2 car lengths before we had to slow down. Then i realized i wasn't even in sport mode. I then switched my car to Sport + mode and the difference was very noticeable on the following runs. We had 2-3 runs where we were exactly even all the way to 120mph. A couple of runs he pulled about half a car length on me. I think by that time my car temps were getting up there as i do not have an FMIC and he does. Also his takeoffs were quicker possibly he was manually shifting with the paddles and i was not.

Overall great runs and were were both pleasantly surprised. BM3 is a great flash tune. I was extremely happy with the MHD performance as well considering i dont even have FMIC yet or anything else. Just downpipes, and we were neck to neck on the latter runs.

I am expecting even better performance from my car once i get FMIC and a new filter.

I would be happy if Rob comments on this as well. Too bad he sold his X4M40i recently.

As far as the flash tunes, you can't go wrong with either one. They seem to be equal in performance, at least in my experience.