I have two question i am going to get a new oil pump.
1. Is it true that the type r's oil pump is better then my rs oil pump.
2. what is different from the oil pump OEM type r oil pump to checkers type r oil pump. (which is better)
yes, the gsr or itr oil pump is better. the weak link is the gear.
aftermarket oil pumps can be ported to flow better (i.e. Endyn's) or can be made more reliable under sustained high heat conditions like road racing or Solo1 by swapping out the oil pump gear for a billet piece...(Z10 Engineering sells a billet oil pump gear upgrade as well as Toda)..only if you need it.