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This is my Shelby's first time on Dyno. 501 Rear Wheel Horsepower(std.) 490 RWHP(sae) Only mod is a Ford Racing Exhaust (stock Ford Tune) "Big Daddy" Dwayne Gutridge of BigDaddyPerformance.com dynoed the Shelby for me at his shop. Thanks guys! www.HotRodHarrys.com is my auto website