similar specced engines chip, some always produce more an some provide less. its a fact of life. no-one can say that with x part and x things done to this and x thing done to that will produce x power its always variable. just as i said that some drive better than others.

i'm not against rr mapping as i've never had it done and i don't do that type of work or know enough to do it. but i have had one road mapped and been around a fair few that have.