not sure if i understood ur question right but here goes..
im guessing you have a b16a engine as the c7 IM wont fit on a c2. ive heard of a few dyno sheets where the b16a IM manifold out performs the b18c7 manifold to about 7500-8000 rpm.. anything over that, the itr or blox etc would be ideal. the flow of the b16a is very similar to the itr, provided its a second gen b16a. imho, not worth it, keep the b16a IM.
as for exhaust manifold, id say either go with jdm dc2r headers and cat, or something aftermarket, 5zigen buddyclub etc. i you wana be baller, go with toda!
my mate had a b18cr with a js racing whale penis. was pretty average getting heat soaked, up until we led a pipe from the front bar to a custom airbox. definately made a huge difference. the car is noticably more responsive.
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