I am, by far, no jetting expert. I own a 06 yz and I plan on getting a powerbomb header and a speed muffler. (I would get the 4.1 but I ride around my neighbors. I think the speed is almost the same as the powercore) When I put this system on, what kind of changes should I expect to my jetting. I have a 48 pilot in it now and it works great. But would my main or needle change? Thanks everyone.