All I will say is the modified B5 gets substantially better mileage then stock... it also is substantially better on fuel then any 3 port, 5 port or 7 port I have ever run or seen run.... It is also one of the fastest .21's I have ever come across........ I know the guys reporting back these crazy runtimes are indeed achieving them, too many reporting it, and too many witnesses seeing it... Steve Svenson ran a complete 15 minute race with no pitstops, went on to win the race as well....Obviously conditions were ideal for runtimes IDK...but I do know these people are not lying about it....it is what it is, what conditions are surrounding these runtimes I am not sure...but far too many people are saying the same things for it to be bullshit IMO.... many of these guys are not engine guys and would have no reason whatsoever to lie about it.... I wish I could say more, but there really isn't anything more to say...... Next season we will do some track videos ourselves and we will see what runtimes we can document... Maybe a few of you doubters will make an effort to see one of these engines run in person, for better or worse.... I am in the middle of Canada stuck under 2 feet of snow, there really isn't anything I can do at this time to help prove or disprove these reports....