the reason why I dont have an intake yet is because I've been wanting the J's Racing Intake but can't install it on my car because of the GS-R's intake manifold. I would have to swap out the manifold for like a blox or skunk2.

About the header and exhaust. My friend has the same car as me and is thinking about buying the JDM Itr header and exhaust. Is he wasting his money?? Will he be getting any power gains? Worth it?

I myself don't know what exhaust or header to get it. Dont want a loud ass exhaust.