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04-12-2007, 01:27 PM
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#2 |
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Junior Member
Join Date: Aug 2004
Posts: 34
Likes: 2
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I installed a Flowmaster cat-back system on my 98 454 dually and it helped decreased my gas consumption by 1.5 mpg. It also seems to have more power as well. The stock monster muffler I have to believe is very restrictive.
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