Project 5.0 Mustang: Improving the Breathing With Ford Racing and Cooling with CSF
In previous installments of our Project Mustang we had installed most of the common bolt ons for our 5 liter Coyote engine. We had gotten a pretty decent boost in power but we had noted that our power would really fall off at higher RPM, more that what we thought a free breathing 4 valve motor should.
What we did notice is that Ford produces a few different OEM intake manifold designs for the Coyote. The two options that interested us were the Boss 302 and the Cobra Jet. The Boss 302 intake manifold is what came on the Boss 302 model obviously. It has much shorter runners than the stock intake manifold and a larger plenum using the stock throttle body. When checking out dynocharts online the Boss 302 seemed to definitely give a top end boost at the expense of a little loss on the bottom end.
We also checked out the Cobra Jet intake manifold from Ford Racing. This was the intake manifold that Ford created for the naturally aspirated Cobra Jet drag car. The Cobra jet manifold needs a really big Ford Racing oval throttle body and a specially designed Ford Racing cold air intake to mate with the throttle body.
When looking at other peoples results online, this seemed like the manifold to get for a stock Coyote with long tube headers. The Cobra Jet intake manifold seemed to have the same slight bottom end loss as the Boss 302 intake manifold but a definite gain over the Boss 302 on top end. So the Cobra Jet it was.