Does a 2004 Mustang GT have PI heads?
Does a 2004 Mustang GT have PI heads? Today, all Mustang GT V8 engines from 1999-2004 are the PI engine, whereas 1996-1998 4.6's are referred to as NPI (non performance improved) engines. Can a 1999 Mustang GT be changed to a PI head? 1999-2004 Mustang GT Cylinder Heads. Ford Racing Head Changing Kit. New Valve Covers If Necessary. The PI heads from the 99-04 Mustangs outflow the 94-98 heads and when paired with the correct PI cams and intake manifold, they deliver a huge increase in horsepower and torque. What kind of cylinder heads does a Mustang GT have? The...