Originally Posted by jonny s2

If there xe they r n/a pistons used in gsi astras,20let r like calibra turbo so are forged low comp for turbo application,you could prob machine the xe piston but i wouldnt run massive boost through it,tbh you only need forged pistons in these engines on std rods to do your required power, ecu think you can run greens on fezzie management,need a re-map tho