[8D]I was up at lukes shop. he just finished putting a trail sled back together that he did a port and polish job, all he did was set the top of the ports to factory specs, clean up the transfers a little bit. that little engine sounded so crisp, and snappy. I thought my sled had a pretty good response, but untill i heard that thing now i can hear the blubber in the stock sleds. I am going to learn this stuff so i can do it to my future trail sleds!!!!