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Getting a higher flowing exhaust should not hurt MPGs but it is not likely to help. If I were to do anything I would replace the CAT with a quality highflow unit (some flow well but after a year degrade and flow worse than stock) and replace the muffler only if it is rusting out and needs replacement.
Just for the record you can NEVER have to little back pressure you can only have a lack of exhaust scavenging.
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"It's not rocket surgery!" -MetroMPG
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