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Old 11-05-2011, 09:23 AM   #71 (permalink)
Varn
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Any time your exhaust is free flowing beyond a certain point you are pushing more combusted and unburned gasses out of the exhaust. Manufacturers know this and add catalytic converters to make sure it doesn't get into the atmosphere.

I think an interesting experiment would be to block a bit of the exhaust and see if helps fuel efficiency at low amounts of throttle settings.

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