8. Rowing up to Fourth gear, a full-throttle pull to 4,500 rpm was recorded and analyzed. Everything looked safe, air/fuel was balanced, but ignition timing was low, netting a conservative 363 rwhp and 490 lb-ft of torque on 93-octane pump gas. After three more 6,600-rpm pulls with a couple more degrees of timing, (19 degrees), the average was a respectable 428 rwhp/481 lb-ft of torque. Standing beside a blown Mustang with headers and a short exhaust is an exhilarating experience! You feel it as much as hear it.