ITR and any LS header would work.
1994 thru 1999 GSR header down pipe is to short. You can use 2000 to 2001 GSR header with no modification needed.
EDIT: Sorry I was thinking Gen 3 teg.
After some searching found this on the net.
Exhaust manifold
Question: will any b-series exhaust manifold bolt on to any b-series head?
Answer: Yes it will, the bolt patterns are identical.
Question: Will there be any fitment issues?
Answer: There may be fitment issues using a b16 manifold on a b18 block due to the length of the header. the deck height of a b16 is almost an inch shorter than the b18.
reusing your stock manifold when going LS/VTEC will work, but the 1990-91 design is even more restrictive than the 92+ design.
Question: are there any differences betwen Gen 2 and Gen 3 exhaust pipes?
Answer: YES!!! The flange is identical, as is the mounting points, but the dimensions and overall lengths are quite different.
Even between Gen2's there was a difference in the length of the Catalytic convertor (AKA Cat) and length of the A-pipe.