American Racing Headers - 05-10 Mustang GT Long Tube Headers -1 3/4" Primaries, 2 1/2" Merge Collectors, 2 1/2 X-Pipe (No Cats) MUSTANG 3V 2005-2010 Yes, we love Fords also! This is why we developed what we feel is the finestheader systems available. Manufactured in 304 S/S, our longtube systemsare engineered for a great fit and outstanding performance. With 3/8" thickflanges, merge collectors with scavenger spikes, direct bolt-in X- pipe withyour choice of no cats or with our severe duty high-flow metal cats, otherbrands simply don't measure up. Systems are available with 1-5/8" or 1-3/4"primaries to accommodate normally aspirated or supercharged applications