Je, or diamond, don't buy the trw's unless you change the pins or you may spend xtra money balancing(heavy metal) and why buy a cheaper piston (the trws) and put more money w/ them to save money somewhere else when you can buy a "real" piston and probably end up not spending as much in the end even though the intial cost seems high, and remember in the end you know you'll have nice stuff. imo