I concur with Trey. These mills seem to prefer to be tuned from the bottom needle first. Also, in my experience, the P4 is the best plug. Lastly, I'd stick with the 2057 pipeset. It will be a bit softer on bottom, yet pull harder mid to top, offer more top end and mileage than the 13. As for the 56, I've never liked it. It seems ok on bottom, comparable to the 57, insane mid, but feels to me like it chokes the engine down on top. One more pipe I have recently been running my Ex Tech on and it has been awesome with, is the Alpha Plus 0801. It is also built like a tank, kinda like the JP series. I would personally highly recomend trying one out if you've got a friend nearby that'll let ya