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A big difference from the Mustang 5.0 to the grand marquis 5.0 is exhaust limitation, your diameter from the down pipes back to the muffler are considerably smaller than the mustangs 2.5 to 3 inch exhaust , next time you need a exhaust system replacement , think of a dual exhaust system , you can pick them up for around 200-250 through summit , or 300-400 through flowmaster, if you dont stand on it all the time you will notice around a 2-3 mpg improvement, also mustangs weigh a crap load less than the grand marquis you at about 3775 curb weight and the mustang is 2775
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