ok i have a gsr and upgrading cams with blox racing stage three hsl and idk if i bhave to upgrade my stock pistons with it ihave the dual valve spring and retainer i also have a set of ctr and itr do i need to go with others???:runaround:

With cams like that you'll need to upgrade the Springs and retainers without a doubt. What atre you doing for engine management?? and you have a set of CTR and ITR what? pistons? retainers? springs?