alot more torquey with the kit, i have 27" vampires and i have a little trouble spinning them in soft sand on the beach and in super thick mud, but other than that they say it lets the engine get up another 500 rpms before it is time to go into the next gear or something, thats what i understood from it...but i went to the beach to ride before i had the kit on and then i went after the kit got put on...after the kit it feels like my bike wants to pull a wheelie everytime i take off, and i have never once done a peel out in sand and just dig the rear end down till im laying frame until after i put the kit in...i have yet to see how it is in the usual mud i ride in yet due to a broke bolt on the front case that you take off that i am extracting and repairing, once i get that fixed i will go riding in some mud and let u know how she rolls...but if u look at some videos of ppl with kits they turn huge tires way way easier...it gives ur bike some power that it lost when u got the big tires and whatever else...very cheap mod so you really cant go wrong with it