Those LS1's come good stock, but also when you put higher flowing heads on them, the difference in performance gain won't be as great or at least seem as it is for us 5.0s. Those LS1's come about as good as they come out of the box!
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1993 Mustang GT - March Ram Air, K & N filter charger, Pullies, Super Competition Hooker Headers, 2 1/2 in. mendrel bent cat back, High Flow H-Pipe, Pro 5.0 Power Tower
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