pro-x are a cast piston alot lieka stock piston.. in fact if you take a PRO-x and a stocker and set them next to one another they are damn near identical.. i knwo on banshees they are for sure.. blasters i assume are the same deal.. if your going to bore the cylinder then either is a good choice.. if your only going to hone use a pro-x again.. wsieco like less piston to wall clearance..