xx2 on that, no. 3 for me but i have diamond pistons in my motor.I do know of test,s that has bee run on the GN stock pistons 25 psi and still going i think.I would say the Tta piston should do the same.heck it may be the same piston i dont no. what i do no its better to be safe then sorry later, forged for sure if you are rebuilding in the future.