Nitrous fuel pressue info needed

B nitrous record is 12.84.I have B na record at 11.50 so that should bee a easy one.A nitrous is 10.93 at 125 mph,thats the one I really want.Mph is gonne bee hard after i switch from my 4.56 gears to 4.30s.Remember this car has around 270 rwhp.about 305 at the crank.