you can get a straight exhaust ont he 6 and pass emissions, im sure they sell a Mil eliminator for the 3.0 duratec. trubenz.com used to sell MIL eliminators but i cant find them anymore. when i had my svt contour, i read alot of guys used one to run straight exhaust on the duratec v6 motors without throwin a CEL. but those motors dont sound very good straight exhaust.. atleast keep one resonator..