I think that warrants
In the upper RPM's I kept the brake pretty mild, but it gets more aggressive below 2000 RPM's....the bastard tries to put you in the windshield from 2000 down to 1400 RPM's. It keeps the converter locked down to 2nd gear and 12mph instead of releasing at 18 MPH in 3rd.
Off the throttle and on the brake it'll easily make 6 psi of boost. I'm trying to get it where it'll make 2-4 psi of boost at idle. :-)