Ford Mustang 2011-2013 Long Tube Raw Steel Exhaust Header The main difference is that

The main difference is that there is an open area under the plenum chamber

The cells have foam in the base to prevent fuel aeration

Speedmaster aluminum Water Pump pulleys are manufactured from 356 aluminum that is heat-treated to T-6 specs

They will help to give your motor extra life

Speedmaster lightweight crankshafts are perfect for engines wanting quicker rpm

Ford Mustang 2011-2013 Long Tube Raw Steel Exhaust Header The main difference is thatIncrease your horsepower and torque for your ride just bolt on these Speedmaster headers! These headers are designed with 3 8 in. thick laser cut flanges and mandrel bent primary tube. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.