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After some more tuning, Starkey made another pull on the Dynojet. The exhaust system helped, bringing output to 773 rwhp and 720 lb-ft of torque-an increase of 3 hp and 11 lb-ft over the stock exhaust. The gains are consistent throughout the entire curve, even though the conditions were a little better before. A total gain of 41 rwhp and 12 lb-ft of torque may be just what you need to take your GT500 to the next level.