Heres Cody, Owner of a 10mil 570cc twister running on 110 octane with 38:1 mixture.... I slap mine in 3rd in flats bec im 200 pounds at the dot. My bike is set for 255lbs in 2nd. What helps is the +12 extension swinger and +2 extended A arms with axles. All i can say is... Felt worser than an rocket taking off. I always love the drag banshees! If u aint got any fears, just hop on ride with jesus!