Tubeworks 45/15/1 wide ratio reduction kit gives you the power you need while still retaining the high MPH that the makes the YXZ so popular. 1st gear is reduced 23% to add 45% more torque to the tires to get you out of those sticky situations. With the 15% 2nd to 5th gear reductions, a 31? tire will the the same acceleration as the stock 27? tire. The 23% 1st gear reduction allows you to move the vehicle around slower and load on your trailer with confidence. This kit also includes the optional 9% overdriven 5th gear for low RPM cruising or for potentially 100 mph + top speeds, *if you have the horse power. This kit requires no machining and can be dropped right into your transmission.