Dynamometer Results & Comparisons - Will a fan change dyno numbers?

Will having a fan in front of your car change dyno numbers much or at all? My friend has a 06 mustang GT that dyno'd 291hp and 317 tq without a fan. Programmed, CAI, orx, bassani. If the fan was in front of his car, would he dyno higher numbers or what?

It could make alittle more power supplying air to the filter and cooling the motor.The #'s look close for a 06 GT.

He thinks he would be able to hit the 300 mark with the fan. I wasnt so sure about that though.