If useing boost or n20 its always best to have forged pistons do to stock cast pistons don't like heat and pressure..so useing stock rods with forged pistons is fine the rods will handle a nice shot of n20 and low/mid boost...but you "can't"use forged rods with stock pistons unless they get machined with c-clips to hold the pins in.and no one does this except vitra but only for there 75mm pistons..