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Old 02-27-2012, 12:23 PM   #12 (permalink)
speednut
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Join Date: Mar 2011
Location: Winnipeg
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My experience is that opening up the exhaust may improve mpg on a vehicle using a carburetor, as the jetting is generally unchanged, allowing the vehicle to run leaner. On a FI vehicle, the computer compensate immediately for a bigger exhaust by increasing fuel to get the correct a/f ratio. Just my $.02.
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