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A 1 7/8-inch header might be a bit large for a stock engine, but the results speak for themselves-we saw a 24-rwhp gain over the factory parts. The tune was left largely identical, including the air/fuel ratio. Tanner only made minor adjustments, but nothing significant that would affect the horsepower department. We feel the 24 rwhp is an honest gain over the stock exhaust and a similar ECU tune. View Related Article
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