I put them on my 97, dyno this sunday, let you guys know the difference and put the no power rumors to rest, good or bad.
Keep in mind if you need them the section aft of the header from a 98+ is needed, the flange from the new header is totally different and will not line up to your OEM "flex" pipe section. 100% positive on this, I just put mine on 2 weeks ago. Email for any details if you go ahead with it........
Personally I think there is some power there.