TYpically I can see about 1 minute more runtime with the 2057. As the other guys were saying a lot of runtime is how you drive in your track conditions. I do not limit my throttle and I use the stock restrictor. BUt if you havent mastered your throttle control yet the limiting your throttle,smaller restrictor and 2057 pipe. In a sense helps do it for you. The 2057 does get better mileage, but a lot of it also it is that is is smoother on the bottom making it more forgiving to throttle burst's, keeping wheel spin down making for better runtime and less wasted fuel and traction.

But Still I will switch pipes depending what I want, and the conditions. I can not say that the 2013 or 2057 is better than the other. They are both great pipes and they completly transform the power band of the WERKS engines, so you can pick the feel you want which is a very nice option.