a turbo 800cfi would eat vforce reeds in 1 ride..... as for the stock reeds i went through three sets last year, all lasting about 1000 miles a peice, it all depends on how hot you run your sled... if i kept my exhaust temps around 1100 degrees or lower they seemed to last longer, but my sled runs way better around 1200 degrees, and on long pulls it will spike up to 1250 range which burns the tips off the reeds. my reeds failing as far as splititng not related to the heat issue, seemed to go hand in hand with the throttle body boots tearing, once the pressure was leaking the reeds didnt last any longer. i now have one of the bracket supports for the throttle body boot and it should keep everything in tact and hopefully make the reeds last longer