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The 6.0 PSD and the gas Super Duty are not the 6.4
also when comparing across the brands make sure that the comparisons are for same CAFE status.
From 2007 forward the emissions standards tightened and combinations of EGR/coolers, exhaust catalysts, particulate filters and DEF injection were incorporated.
a lot of the feedback on these models is related to some difficulties related to these changes.
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