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Old 03-01-2009, 02:19 AM   #24 (permalink)
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honda cb125 - '74 Honda CB 125 S1
90 day: 79.71 mpg (US)

green wedge - '81 Commuter Vehicles Inc. Commuti-Car

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Aluminum tends to crack when subjected to vibration, steal flexes, exhaust also flows better when it's hot so aluminum would tend to cool it more, Titainum and stainless steal are insulators to a point, so they allow the exhaust to stay hot and flow better.
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