Ran them all last year in mine when it was all stock and using them again this year with the turbo. For a stock or bolt on modified viper you'll want the 53-69 weights. My experience with them has been great, they're simple to adjust, engagement (with proper spring setup) is smooth as butter and when u hammer on it they hit hard and shift fast. For my turbo this year I jumped up to the heavier weights but even at 180-185 hp the 53-69 weights will work if you fill them right up. I'd say they can be adjusted for sleds that range anywhere from 120 up to 185 hp so the range of adjustment is huge!