I'm looking into buying 00 ITR cams, IM, and a JDM ITR header for my basically stock JDM b16, any other suggestions? Also would anyone happen to know where I can get a cat to bolt up tp the 2.5 flange on the header. Thanks

 

That's a good combination, I would go for type r or gsr valve springs, just to make it safer, and of course a good intake, AEM cold air for example.