I'm impressed with how this pipe works on the BMP cast kit for M7. Their BD numbers turned out to be pretty good. Ran like chit two weeks ago during the big deep. Dropped a 3/4 gram out of the Cutlers in the garage later and span good at 8K with my fattened #'s. If you got and M7 or 8 you should do it. I like the pipe manners on this 16:1 head. Twins (Jaws -M 7 twins..) just cranked compression way beyond spec and deto was out of control when the temps got warm. It pulled the skis a few days, but I doubt they work better than this single for TQ, overall.