Well, im happy but dissapointed to. I ran my best et and 60ft but my mph sucked. Ok, stock everything not lowered I was running 10.70's @ 137-139mph with 1.95-2.05 60ft's. Now I have a 16 tooth sprocket in the front, lowered 2's in the rear, 1.5 in the front, and the shorty pipe and my mph was bewteen 135-136 only. Im wondering if I need a map or the pipe is killing my topend. My 1/8 mph was only 109. Check this, my 60ft's were consistent low 1.8's, finally, with a 1.81 being my best. My fastest pass of the night was a [email protected] with a 1.83 60ft and it was against a stock but lowered zx14. I barely got em on this run, he ran a [email protected] AnywaysI was expecting my mph to be around 140 with the sprocket but I think the pipe is killing me up top. On August 11th, I will go again with my stock exhaust on, lowered the same and the 16 tooth and see if my mph is up with the stock exhaust versus the shorty pipe. I know there is a lot more in her.