you guy are comparing 2 totally different kinds of pistons. SRP's have a high silicone content built into them thus allowing you to run a tighter piston to wall clearance but theyre not as strong as a fully forged piston. the expansion rates on an SRP piston are much less than most other aftermarkets which can definitely be a good thing in a motor that is meant to run for than 10k miles at a time w/o a rebuild....i can keep going on and on comparing different kinds of pistons but my mind moves a lot faster than my fingers and im sick of typing