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Making Brake Ducts
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08-24-2017, 10:58 AM
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bNks334
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Drives: '11 135i (N55)
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3" does flow better than 2.5," but no one here is endurance racing lol... diminishing returns imo
2.5" is nice because it fits well. I can't imagine trying to squeeze 3" piping through a 1-series. 2.5" seems perfect.
Appreciate
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AndyW
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