JDM_EK_JOE

Hey all, looking to build my b16a2 swap which i have sitting in my garage. anyways i have 97-99 ITR cams, but i will only be using the exhaust (all yr ctr/itr exhaust cams are the same), i'm recieving a ctr intake cam soon and tomorrow im picking up Skunk 2 tuner series 5 screw/bolt Adj. cam gears and ITR Intake Manifold and ITR Throttle body. I'm also looking at purchasing a used jdm dc 4-1 (2.5" coll.) header which, from researching, is the best bang for the buck. I will be running a Virgin P28 for now, but once i get a tune, thats when i will get a chip installed

Now i just would like to know what you think of this setup and i have a few questions:

1) Is it ok to run a 2.5" collector but use a 2 1/4" itr exhust, kinda on a tight budget and dont wanna have to buy a custom exhaust/muffler. you recommend a cat/test pipe?

2) is the B16a2 fuel injectors good size or should i upgrade to anotherset of used oem honda ones. dont have alot of money for aftermarket. also, i would need a FPR, FP Gauge but dont necessarily need a aftermarket fuel rail, correct? i could mount the fpr & gauge on a b series rail..

3) i understand its a 1.6L and im limited to power with staying N/A but i just want to make a reliable b16 with a clean, reliable, and semi-powerful setup, ANY ADVICE is appreciated.

thank you and sorry, im just looking for the best advice which is why im asking Honda-tech