Hold on guys. Now naturally I will be a little biased, but I did race a 97 or 98(not an HO) MXZ 670 with my 02 ZR 600 EFI with power valves. I got him off the line every time, and walked away until about 60 or so, when I would stop pulling away, though by this time I had him by about 4 lengths. The 670 is a fast machine, and the HO would be tough to beat, but the ZR is fast too. We will probably have a rematch later this season, and he wants to stud his track some more, but I don't that will help a whole lot.