If I remember correctly when I was looking for a CBR900RR header, I considered "new". I approach the parts section of my local Honda shop and had the clerk look it up. I think he said that years 93-95 had one part number and years 96-99 had another, the only difference being the color. I found what was sold to me as a '95 header and muffler, used, on ebay. The muffler is gloss black and the header was a dirty dark gray. The header had the usual three bolt flange to attach to the muffler. I didn't use the stock muffler as I found a "Wileyco" brand carbon fiber can to replace it. It needed the three bolt up method so it worked fine. I seem to remember someone saying some of the headers had a slip on system rather than the three bolts but all the ones I've seen with "HONDA" stamped on them (not Two Brothers) used the three bolt attachment.