i was going to buy some type r valves, valve springs and retainers off of a friend. That was until a mechanic told me that the tpye r valves are exactly the same as the ones in my b16. he said that the valve springs are the same too. I find this hard to believe because the itr revs to nine while my b16 only to 8 grand. also i am buying some skunk2 stage 2 cams, so should i just buy skunk retainers and dual springs instead of the type r valvetrain??? also i was looking to buy his itr tb and intake manifold, how much better would this flow than my stock ones??? thanks for any help.