Bought a truck here. When I went to go and see the truck, it had a sticker that was certified clean air. When the truck was shipped to me the sticker was gone when it had arrived. Didon't think much of it until I started having problems. Later I found out the truck had bad injectors, a blown head gasket and a bad dpf filter. Had to spend a extra 7 grand on repairs. Do not buy truck if you can't dyno it.