how reliable are the itr pistons, rods, valves, valvesprings, retainers, camshafts, etc. are there very strong. can they handle boost or nos. is there a difference in the jdm or usdm itr pistons.......etc. are they good to use for all motor setups. or should i just go with aftermarket. the itr engine parts would be for my 98 teg gsr. thanks for the info. any sites you know of that can help me with my question, let me know please.