Like the exterior, the GT's cabin is hardly stock, but neither is it overdone. A custom six-point chrome-moly cage is a welcome safety fallback should those 600-plus ponies get out of hand. And we like the way the side bars are bent to ease ingress and egress. Notice also the Blitz boost controller just to the left of the steering wheel. For the street, a 3.27:1 gear ratio keeps engine load up and boost on tap, while a Tremec TR6060 six-speed, fed by a twin-disc SPEC clutch, helps keeps the revs in the right range.