Hey Robo's, I had the same problem too after installing my Profec B. Everybody is either telling me this or that but no one can give me a good solution to this cutting off problem, I paid a visit to one of our tuning shops and the mechanic listened intently to what I had to say then he walks over to my car,popped the hood and unpluged the MAP sensor driving the stock in dash boost meter. Then he said " Now take it for a spin and see if it's still happening" . Took it out gave it a good wallop and NO MORE CUT OFFS! Everytime!
Now I gotto go get me a boost meter.