You'd need a helluva brake setup to brake-boost on our cars.
My car, about 200rwhp, couldn't hold traction at the rear wheels past 2000 rpm, and this is with sticky Z-rated tires. My turbo spools at 3600rpm... so I chucked the auto in favor of a manual.
Also, many people at 5psi run about 14.0... I ran a 14.8 in my auto.
-Jeff
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