using a b16 tb will work but would defeat the purpose of the itr intake manifold. the itr mani has a wider bore than the b16 tb. u would need to widen the bore of the b16 tb and replace the butterfly. simply boring the outside of the tb is not as effective (spoon does this on their peices) but if u cannot locate an itr tb or an aftermarket peice then u can taper the outside of the b16 tb, not as good, but better than leaving it stock HTH's