Porting the turbo on Bryson's "Initial D" 1987 Mazda RX7 FC

This car pumps out 13.5 (or more) pounds of boost without any intervention from the turbo controller. I don't like that! So it's time to fix it. The spring cracks at 6 pounds and is all the way open at 10 pounds, so we must have inadequate waste. Let's tear into it!