Quote:
Originally Posted by vskid3
I would be willing to bet that Dave's truck ends up putting out less emissions than stock. He doesn't have to waste fuel clearing out any filters and he probably drives a lot more sensibly than the average person with a diesel truck.
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CO2 emissions are definitely way reduced. NOx and PM are almost definitely still higher, because the 2007 to 2007.5 change was an order of magnitude decrease in NOx and PM standards.