the question is - from which ZX9R - you`re writing about stainless steel but the exhaust system from `94-`97 (ZX9B-model) isn`t a stainless steel one at all!
If you`re talking about a stock exhaust system it could be from a later model.
I can`t remember anybody writing about later ZX9R exhaust system fitting to the `89 ZXR models!
So maybe you have to check on your own, what is possible. In my opinion it won`t fit `cause your ZXR has the "steering-chain" in the middle between cylinder 2 and 3 and afaik have the newer engines the chain located on the right side.
If you`ve got any question don`t hesitate to ask - but I`m not specialised neither on the H-model,nor on the ZX9R, sorry
