BBK 1-3/4 inch Ceramic Finish Tuned Length Header helps you to get even more horsepower and torque out of the all new 2011 and 2012 5.0L Mustang. It is already putting out nearly twice the horsepower of its 5.0 predecessor. This all new rugged BBK header design is constructed with 1-3/4 inch CNC Mandrel-Bent tubing and solid 3/8 inch laser cut exhaust flanges.