Actually from what I have seen the XP is much closer to the stage 2 than the stage1XThe cam specs on the S1x are so close to the XP
I have the Ls6 springs oin mine and I'm shifting a tad over 6300 (more like 6350) and it's been fine. I may bump up the shift points to 6400.dougsgtp said:any thoughts on the newer ls6 springs? 95 lbs i believe. 6300 rpms, max, yea or nea