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Old 12-02-2012, 10:38 PM   #11 (permalink)
Ecky
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Join Date: Dec 2011
Location: New Zealand
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ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.72 mpg (US)

Oxygen Blue - '00 Honda Insight
90 day: 54.69 mpg (US)
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You might see a MPG loss by swapping to a larger pipe, and probably no power gains either with the stock intake manifold being the limiting factor. A new muffler would be entirely "cosmetic".

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