Looking for some info on doing the stage 4 kit less head work,yammi lists parts as twin cams,and needs the adjustable pushrods,rocker blocks,hydralic lifters and dual springs,has anyone done this hop up,and was it worth it,my bike has vance and hines twin pipes and is jetted only,this is how i bought it,also i plan on getting the modgual to keep the rpms higher than 4400 rpms,that is now kicks out at,any ideas on how much time to change out the cams and valve train parts?? Thanks Pete