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13. After a break-in period, the Challenger was strapped to the dyno for fullpower runs. Blower pulley changes eventually increased the boost pressure to 23 psi, where the supercharged Hemi eventually pumped out 989 Hp and 907 lb-ft of torque. Run at 18 psi (900 whp), the Challenger has run a best of 9.96 At 138.9 mph on slicks.