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hp and mpg increase with aftermarket bolt ons
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07-07-2009, 09:58 PM
SWV10
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Join Date: Nov 2003
Location: New Mexico
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Cat-backs are the way to go. Better sound over stock, increase HP and better mpg.
I did the cat back on my F150 4x4 5.4L and now I avg 22mpg @ 70mph on the highway, cruse on/with air.
Even hot-rodding through the mountains I can get 18.
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