i have the VF30 stage 2.5 and i see full boost between 3200-3500K. i can't really get a full look at my boost gauge and rpm's because from that point the car just takes off. but i feel it pull hard like a mofo at around there. i'm pretty sure positive boost pressure starts around 2700-3000K or so. i'm peaking at about 17.5psi max. that's pretty good considering that the 2.5 map retains the stock intercooler and fuel pump. imagine what will happen once it's tuned for upgraded intercooler and pump. WOW!