I don't, but I know a couple of people that do (KB 1500) and they love them. Great if you've got a heavier car or an Auto. They may not make the numbers on the dyno that most of the centrifugal blowers do, but they definitely put ever bit of their horsepower and torque to the pavement! A lot of the time big dyno numbers with most centrifugal systems don't translated to big times when put to the test. And at the track a lot of higher horsepower centrifugal blown cars weren’t running any faster (slower in come cases) than my buddies twin screw Fox. Kenne Bell is worth every penny IMO.