If you've been following along in recent months, we've been tinkering with a 2004 F-250 by adding some exterior mods as well as adding some ponies under the hood in the form of an S&B air intake, a ...

Diesel engines, for all their rugged usefulness, can be tremendously polluting. They produce more NOx — nitrogen oxides-based emissions – than gasoline-fed cars, as well as more particulates, aka soot ...