fan output question
 

I noticed while tuning the car that around 3000 rpm the fan is producing so much air that it starts to blow back out of itself. I have heater blockoffs as the engine had PMO ITBs, EMS, and headers. Should there be some sort of relief so the air can go someplace besides back out the fan. Seemed very strange to have air blowing out of the fan instead of sucking in.
Car does not seem to overheat even when being dyno'ed

Are you sure that rats haven't nested in your engine?

If they are, they are damn fast rats. I just assembled the engine the day before. This was a 3.2 carrera with heat at one point. It used to dump excess air out the heater tubes. Those tubes are now gone so the air appears to have no place to go.
Perhaps I should put some holes in the block off plate to relieve excess pressure. Surely someone has had this problem with all the heater removals.