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need mpg

  1. Performance Upgrades
    I have a bone stock DEF equipped 2014 3500HD. it’s a CC/DRW 4x4. I want to delete the DEF system but I know the epa has tied everyone’s hands. Mainly looking for mpg. It has plenty power ( I know you can’t have too much) Should I just tune it and keep the DEF system intact? Looking for...
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