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It sounds like you have your mind made up already, it also sounds like you have not read any air intake or exhaust design books.
On my car I've had to replace both the intake resonator and switch the exhaust back from over sized to stock and saw a MPG increase with both of those.
Also, what is your current exhaust back pressure and what do you hope to reduce it to? (do you even know if you have exhaust back pressure?) you can have exhaust back pressure tested by a mechanic pretty easily but larger exhaust tends to increase the back pressure at lower revs because of loss of momentum of the exhaust gasses.
So please, before you spend any money make sure that you understand what you are doing, pretty much any book on exhaust design will give you the formula to size your exhaust for the engine speed that you want to run at and you just might find that your current exhaust piping is even larger then you really need if gas mileage really is your goal.
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