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Hi, this my first post on the forum. I have a 06 dodge 3500 CTD, stock except for a jake brake, not the one preinstalled, thats on the 07's, I have the one from cummins. My question is, which exaust should I get? I want an exaust that will get me more mpg, I don't have to have more power (it already has more then enough), but more power would always be nice. My main concern is more mpg. I tow a 14000 LB fifth wheel and want to increase the mpg. right now I get about 11-12mpg towing the fifth wheel, I have the automatic transmission.
 

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4 or 5 inch tbe would probly help, muffler or straight pipe. intake would help too. check out farmboys diesel, they got good prices.
 

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I've always had mbrp pipes on my trucks and they seem to be good quality.. But I just bought a no name 5in straight pipe kit on ebay for $309 shipped and am super happy with it.. Loud but that's what I wanted...
 
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