Today on my way into work I pulled out of an intersection thats uphill and floored it. Best it could do was 16psi, and that is the highest I have seen it go. I have the Ford Severe Duty intake, 3.5" Exhaust, 37" Tires, and a Edge Evolution set on Level 1. I would have thought from everything I have seen on here that I should have been able to get closer to 20psi, even if it was stock.
-Aaron