These headers were designed for use in the installation of Ford’s 2011 5.0L Coyote engine into Mustangs from 1986-2004. These headers were prototyped on a 1990 Mustang with a Maximum Motorsports front crossmember but they will also work with stock crossmembers.
Raise vehicle up and support with sturdy jackstands.
Start on passenger side. Remove starter. Header has room to reinstall starter after
Remove motor mount stud nuts from both sides and jack engine up. Move engine to
passenger side slightly.
Feed passenger header in and onto engine from below. Position on head and install
a bolt to hold in place.
Install gasket and supplied bolts to finish. Reinstall starter.
Lower engine down and loosely install the passenger side motor mount stud nut. Jack engine
back up and it will pivot toward the passenger side.
Disconnect steering shaft at rack and pinion and set out of the way.
Feed driver side header in from below also. Then up onto the head. Install bolt to hold in place.
Install gasket and supplied bolts to finish.
Lower engine back down, reinstall driver side nut and tighten motor mount stud nuts both sides.
Reinstall steering shaft, tighten bolts.
O2 sensor extension wires have been provided for the front sensors. There is a supplied plug in the hardware kit for the extra O2 sensor bung in the driver side collector. The bung is for connecting a wideband tuning probe.
Matching short X-pipes are also available:
1786 3” X-pipe with Hi-Flow cats.
1787 3” X-pipe Off Road