I dont know if this has been covered or if there is even a difference but figured I would ask before buying. Is there any MPG or power improvement between a 4" or 5" exhaust? I'm planning to buy the H&S mini maxx and running the tunes that come on it. So what would be better for me?
08 f350 6" lift 37" tires ...stock 8mpg ....5" no muffler cts s/b intake 15mpg hwy 12 to 13 city ......my buddy has the same truck but with 4" no muffler and he gets the same
Be careful not to break anything so if you have to put your stock setup back on for warrenty issues then you still can.
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