My 97 f150 4.6 gets only 15mpg on trips. Will a flowmaster or magnaflow cat-back dual exhaust really help improve mileage. Not looking alot of noise inside or out, just performance. Any accessories you know that may help? Thanks for truthful answers.
by 
baldy1
ANSWERS: 3
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A free flow exhaust system will improve performance somewhat which in the long run will increase mileage. Replacing the stock air cleaner with a K&N or equivalent at the same time is also a good idea. Don't expect a miracle though. With both of these mods you will probably on get a 1 or 2 mpg increase.
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with having 2 cats and 2 collectors =4 u can remove the muffler totally and put in just a piece of pipe. also remove the rear collectors and have the stock cats. but have to have the two cats or it wont run right. computer stuff
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I doubt it would pay itself off, funny thing though I had a 97 4.6 when i bought a 99 5.4 I got better mileage with the larger engine, the 4.6 always seemed to downshift alot when driving around town
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