Ok... lets forget it now. Maybe its true, maybe BS or maybe someone played with the 'X' Factor on your dyno run. Having said this 15.094 @ 91.94mph even on a hot day would maybe equal to a 14.8/14.7 at the best if you are lucky. Probably even with all the best setup and dragging technique.
Sorry ben, but you have to be realistic, a FLAT 14 or high 13 is a loooooooooooong way from 15. Especially for a non turbo. But anyway, good luck.