I asked the guy in St. Louis who owns a race shop (builds actual race cars) and has installed a few sets of leargears in our cars what he thought about Quaife read ends. He said it all in how they are set up (when they lock ect), but he personally in his expirecne he didn't like them for a track (w/ turns). He said our stock setup would probably be better suited for turns but he could see why people who do straight line racing would want them. I am personally unqulified to comment beyond this - but thought I would throw that out there for either comment or correction here.