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2007 chevy HD

  
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2007 chevy HD

 
oldmeangrizzly oldmeangrizzly
New User | Posts: 1 | Joined: 06/07
Posted: 06/15/07
02:15 PM

Please help, looking for better mileage on my 2007 chevy HD 6L. Does dual exhaust help or a performance air intake help.Also any ideas on a super chip. Thanks for your advice  

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