I put over 140,000 miles on my Power Trax, but that's in a 4X4 truck that I drove to work every day. I wouldn't use one in a performance car (or truck) because there are better differentials out there for that. The Detroit Locker is a great drag race differential that also works well on the street. I had one in my Camaro for many years and only took it out to test a new Dura Grip. They do pop and jerk some, just like the Power Trax, but they are much stronger.