Wiseco pistons are a high quality forged stock replacment piston. These pistons can be used with stock or aftermarket connecting rods but not with the Carrillo rods without machine work to the rods. Offered with 8.5 to 1 compression ratio (stock MINI ratio), in standard and 0.020in over bore size. They are forged, so they'll handle any amount of boost you can throw at them, but lightweight so all that power gets to the ground. Sold in sets of 4 and include pistons, rings and wrist pins. We keep 77 and 77.5mm sizes in stock.