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Discussion Starter #1
Just want to squeeze a little more miles /gal. would a straight through muffler and a 3 or 4 inch tail pipe make a difference?
 

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Yep some people claim 2-3 mpg (w/o cat) but ive never figured it myself. Do turbo back 4 or 5 inch for best results without cat.
 

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If you do 5 inch and you don't have atleast 500hp it will hurt your truck performance
 
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