Hey, I think you missed it. DC Sports does make a 4-2-1 Stainless Steel header for the 98 ls/rs/gs.

Here's the link. Just go to the bottom under
Acura 4-2-1 Headers Stainless Steel.

4-2-1 SS Headers By DC Sports

The Part Number is: AHS6006

Hope this helps.

Btw, DC Sports doesn't make the 4-2-1 SS header in a 1 piece for your car.