I ran there kit in my SLP performance package and it worked great. I had the 8-10K kit which included a 160/310 primary spring, 74G MTX weights with no weight added, 44/36 helix with the stock orange cat spring. I also had them balance both my primary and secondary clutch. Mine does have the slp pipe and porting but I was very happy with there clutch setup and it pulled amazing. I am taking my secondary up to them this week to have rock rollers installed. SLP does high quality work and I have been very happy with there setup.