Get a K/N or any other brand of intake system. These do work to increase mileage and power. Then a cat back exaust system. you will be impressed with the results.......
Well Mookie, I'm currently working at a country club on the turf management crew, so if I needed to aerate my lawn, I'd stick the spikes on the back of a Cushman, load it in the bed of my ST, and drive it home, and be done with the 1/2 acre yard in about 20min. So to me, it is worthless.