I just bought a Boondocker pump gas turbo kit from Vohk for my 2010 M8 and had them install and tune everything including clutching. Runs flawless. It was tuned to 91 octane fuel with a 1/2 gal of Toluene per tank. Based on my riding style Vohk recommended the stock head with lower boost pressures for crisp throttle response. It has a boost controller that changes boost pressure as a function of altitude. I run it from 8K to about 11k. I think the pressure changes from around 4~7 psi based on altitude, but quite frankly I never look down at any of the gages as I just ride it. This was my first turboed sled and it is wicked fun. From idle to 1/2 throttle it feels just like stock, above that it just makes you grin. It is hard to hold on. I have run it on the trail, in meadows and hills and have found no weekness. Nice crisp throttle response. Good on gas also as I found I was only needing about 1 gal more fuel per day than my buddies stock sleds.
I did receive a little instuction from Vohk on tuning the BD box but it was not necessary. What I did learn from that leason is the Bd controller is a lot more complicated than I assumed. The tuning instructions that comes with the kit from BD suck. I am glad I hired Vohk.
Regards,