I think he was runnin propane...possily
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08 - 6.7 - 6spd - Blk: Tint, Shave & LineX. PMT, MP-8, AFE Stg 2, 5" H&S, BMF 20's, 33's, Leveled, SB DxD 3250, EGR Block, DiPricols, FPE Boost Controller. AD150 & Recons waiting to be installed