Installation instructions for JBA Cat4ward® Headers part no. 2010S
00-03 Toyota Tundra with 4.7L V-8.
NOTE:
Installation of these headers requires an adequate work space, general mechanicʼs tools,
general mechanical “know-how,” a reasonable degree of experience, and a few special tools. Most
auto enthusiasts with these resources will have little difficulty installing these headers. However, you
should carefully read these instructions before attempting to install these headers. If in doubt, consult
a professional mechanic. (Better to do it now than to get stuck half-way through the installation.) This
part is legal on Emission Controlled Vehicles. C.A.R.B. Exemption #D-216-___.
1.
Place vehicle in a location where the floor is solid and flat, with adequate lighting. Do not
attempt to work on a hot engine. Heat causes metal to expand and makes removal of fasteners
difficult at best. Disconnect the battery cables from the battery. Raise the front of the vehicle to
obtain adequate access to the bottom exhaust manifold flanges. Use large-base jack stands to
support the vehicle. Do not rely on the jack! Block the tires to prevent the vehicle from rolling
off the jack stands.
2.
Spray WD-40 or some type of penetrating oil on all accessible fasteners and fittings before
attempting to remove them.
3.
From underneath the vehicle disconnect the exhaust system from the exhaust manifolds by
unbolting the (3) bolts at the collectors. Then unbolt the driver side catalytic converter from
the exhaust assembly and temporarily remove it from the vehicle.
PASSENGER SIDE
4.
On the passenger side remove the (4) bolts attaching the heatshields to the factory manifold.
5.
Next, carefully unplug the O2 sensor from itsʼ harness
6.
Now remove the nuts attaching the factory manifold to the cylinder head. With the manifold
out of the way remove the mounting studs from the cylinder head.
7.
Using a small wire brush or similar instrument, clean any carbon deposits left on the head
surface. Be careful not to gouge the aluminum head.
8.
Transfer the O2 sensor from the factory manifold to the new passenger side header. Apply a
small amount of antiseize to the threads for the sensor before installing it in the new header.
Use caution not to drop or damage the sensor, they are fragile.
9.
Now you are going to install the new JBA Header, but first there is some preparation of
the hardware required. Apply antiseize to the threads of the new fasteners. Install the new
JBA Header using the supplied gasket and fasteners. Torque to 23 ft.lbs.
Drivers Side
10. Just like you did in step (4) remove the (4) bolts attaching the heatshields to the driver side
factory manifold.
11. Next, carefully unplug the O2 sensor from itsʼ harness. Unbolt the dipstick bracket from the
head and remove the dipstick tube.
12. Remove the nuts attaching the factory manifold to the cylinder head. With the manifold out of
the way remove the mounting studs from the cylinder head.
13. Using a small wire brush or similar instrument, clean any carbon deposits left on the head
