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it is well documented that high flow cats are worth about 15 whp. it's documented that shorty headers are worth about 10whp. it's documented that long tubes provide a synergistic effect to both shorties and hi flows by providing a strong 30 whp. a tune will add another 10 - 15whp to any of these, including a stock car.
the better case for the tune is to make sure everything is RIGHT.
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