Can someone tell me what the difference in the 96-98 4.6 engine compared to the 99-04 4.6? why does the newer ones produce more power what did ford do differently? I also heard that it is very hard to get any power out of the 96-98 mustangs, is this true? My car has a Mac 2 1/2 inch inch x pipe with 2 1/2 inch catback with 3 1/2 inch tips. It also has a fenderwall cold air intake, it has platinum plugs with summit/ frpp 8mm wires. what kind of horsepower should I be putting down? and what are some good basic boltons? thanks in advance.