FWIW-I'm using the .28 six port in my 8T and so far it's working great, but I'm just about at the one gallon mark so far and still have the extra head shim installed. I can't say how it does compared to other engines yet either (will get a 2nd hand opinion on it next week hopefully). I'm using the Dynamite 086 pipe. Tons of bottom end (probably too much for me) and the top end seems pretty healthy too. I know I can get at least 6 minutes out of a tank, so far I'm not very impressed with the lack of run time out of it. Going to try a smaller carb insert at some point to see what that does. I still really haven't pushed the limit as far as testing how long I can go on a tank of gas, I just wanted to play it safe for my first race and figured it shouldn't have a problem coming in every 6 minutes.