dieseldummy, the vacuum would be very minimal. Take off your filter minder, stick it in your mouth and suck on it.
Seriously, you will be amazed at how easy it is to pull it into the red. This tells me that there is very little vacuum. I think the intake and filter are big enough to handle the demand with ease. On the other hand, it would be pretty east to put a vacuum guage in place of teh filter minder to see just how much vacumm/restriction there is under WOT. HMM, I might just have to try it for interest sake.