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The 1973 SD-455 had the most stock horsepower of any trans am it had 290 hp it would of had more if it hadnt of been for the tightening emmisions rescritions

www.wikipedia.com "The rare Firehawk model, made by SLP and sold through Pontiac dealerships, had 330 hp (335 after 2000, 345 in late 2002 models equipped with the optional Blackwing intake.)"

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