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Jannetty did a comprehensive test showing the entire curve.
2 inch exactly matched the 1 7/8 all the way to 5-5500 and made 5 more rwhp peak. And this was on a stock ls3. 1 3/4 was down 10 rwhp peak and 5rwhp through most of the curve.
2 inch is the way to go regardless.
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