ScreaminStreetGlide, I was happy with the stock performance of my 09SEUC until I got a tank of non california gas. At that point it started to ping under most conditions hot, cold, under a load whatever.(this happened in Nevada, Colorado, Utah,and Wyoming) That lasted for about 3000 miles until I got back to CA. and filled my tank in Oakhurst when it was about 105 degrees outside and the pinging diminshed immediately. When I got home I put the stage 1 fulsac kit on it. Haven't been out of state since, but no matter what I do locally it doesn't ping. I guess I will find out when I ride up to Canada this summer. Good Luck with your bike. By the way even when it was pinging the performance was very impressive. I am talking about going from 6th gear at 85mph, down to 5th, and up to almost 100 with passenger and luggage in a snap. Got to pass those Ford Tritons who seem to think it is okay to pull a 30 foot trailer at 85mph on a two lane road when the speed limit is only 65. I am not saying I should have gone 100 mph with a passenger and luggage, but sometimes you can only take so much. Besides that they spoil the scenery. CAHDBIKER