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MPG/exhaust

769 views 5 replies 3 participants last post by  late_99_PSD 
#1 ·
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?
 
#3 ·
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
 
#4 ·
p.s the 5" sounds crazy on there i love it
 
#5 ·
Ok, so the H&S mini max, 5" flo-pro, and S&B are on the way. Any tips or pointers on the install? All help is appreciated..
 
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