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It's good news, bad news time, except the bad news really isn't all that bad. After some tuning on 91-octane California swill, we knocked down an impressive 600.2 hp and 609.5 lb-ft of torque to the wheels. The problem we ran into was that, at around 4,000 rpm, the GM six-rib belt started to slip and drop boost. So, while we were hoping for about 9 pounds at 6,000 rpm, we were only getting 7 pounds. The fix is to pick up an eight-rib overdriven system from Innovators West. The extra ribs will support more horsepower and the 10-percent overdrive damper will let us run a bigger blower pulley, which will also increase grip. But that's another story for another day.