I had HP+ on my '91 and loved them at MSR and on the street. A set of HPS came with the '99 I recently bought. They were fine for the street, but I could just feel that they were not up to track duty. I just swapped them for HP+. I'm headed to MSR this weekend so we'll see how they handle the extra weight. Even with the larger rotors that the '99 has over the '91, the HP+ on the '99 does not stop as quick (I'm on the same set of tires). Maybe I'll outgrow the HP+ after a few more track days, but I never had any fade on the '91.