Since gold hatch had an open diff before, installing this makes the car feel much more planted in all situations. The 4.36 gearing makes better use of the KA's power band. the need to shift comes much quicker and it takes advantage of a KA's torque. There isnt a huge difference in gas mileage either. Though I would stick with a 4.08 if all i did was highway driving, I've been to the NC with it in the blue hatch and the mileage was around 25mpg...about 4mpg less than what i saw in with 4.08s on the same trip in the same car the previous year.

It increases the cars grin factor...lol.