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Very little. It is better to have duals instead of single as it is harder for the car to breath. But it can add 5-10 horse.
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∙ 12y ago
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How much horsepower gain does a borla exhaust system add?
eight hp
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Just bought a 07 charger 3.5l how can you add horsepower?
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by itself, not much, not enough to notice, if you go with a performance carb and air filter as well as the exhaust you will see a lot of difference.
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add intake chip from eBay and put an exhaust.
