Novak XBR 13.5 System pro/cons?

[glassdoctor]

Opinions vary... I think there is a difference but it's not huge. The XBR system has the regular bonded rotor 13.5 so it will likely run a little hotter and not have quite as much punch.

I don't run them, but a lot of my buddies do. The guys running the regular 13.5 (XBR) do just fine on the track and you can't tell any difference just watching. I don't know how much of it is in their heads... but some say the 13.5 pro is faster.

Maybe it matters in certain situations like on road or oval... but for offroad I can't see how it's a big deal. It's all about driving.