you still can spin up the hills if you want, but with it you don't have the worry of spinning out on a real steep hill. the -2 just makes it feel like more power is getting to the ground, actually makes you quicker up the hills, front end still doesn't want to come up unless you want it to. sliding is better than stock and the jumping is another plus. feels more like it should in the air, makes you more confident to hit the big jumps. by no means does it make it a wheelie machine, just when you want the front end to come up it will, instead of just spinning the tires.