DISASSEMBLY OF THE LEFT SIDE
1. From below, remove the left-side catalytic converter.
2. Remove the oil passage diverter plate that is located just above the oil filter. Approximately ½ pint of oil will drain. This plate may
now be removed or just prior to the actual installation of the left-side header. Take care not to let any dirt or foreign matter enter
the open oil passages.
3. Disconnect and remove the left-side A.I.R. tube assembly. Disconnect and remove the spark plug wires.
4. Remove the spark plugs. Remove the left-side exhaust manifold.
5. Point the steering wheel straightforward and turn the key to the lock position and remove the key. Remove the steering shaft.
Please take note of G.M. Pt. Notice # 26068010 which states:
To help avoid damage and possible malfunction of the air bag,
do not rotate the steering shaft with the steering shaft disconnected. See the G.M. service manual before disconnecting.
6. Remove the small left-side heat shield / deflector.
DISASSEMBLY OF THE RIGHT SIDE
1. Disconnect and remove the right-side A.I.R. tube assembly. Unbolt and remove the oil dipstick. Disconnect and remove the spark
plug wires. Disconnect the EGR tube by removing the (2) two 8mm bolts.
DO NOT try to remove the tube.
2. Remove the spark plugs. Remove the right-side exhaust manifold.
ASSEMBLY OF THE LEFT SIDE WITH HEADER
NOTE: Use anti-seize on all header bolts and oxygen sensor threads.
1. Insert the left-side header through the chassis from below. While inserting the header in the vehicle, reinstall the oil passage
diverter plate and tighten. Take caution not to strip threads. DO NOT overtighten.
2. From above, install the gasket.
3. Using the supplied 8mm lock washers over the factory exhaust bolts, start all the header bolts prior to tightening, then evenly
tighten all the header bolts to 20-25 ft./lbs.
4. Reinstall the steering shaft and tighten the bolt to factory specifications.
5. Reinstall the spark plugs and tighten.
6. Reinstall the spark plug wires. Check to ensure that they do not contact the header.
7. Reinstall the left-side A.I.R. tube assembly.
8. Install the left-side pre-catalytic converter oxygen sensor into the left-side header collector.
NOTE:
The oxygen sensor simulator
needs to be installed according to directions supplied by the simulator manufacturer. Use the 28” supplied extension to complete
the simulator install.
NOTE
:
These Oxygen Sensor Wire Extensions are made long enough to use either the Oxygen Sensor with the 8” wire length or the
Oxygen Sensor with 12” wire length. Any excess wire length after installation should be looped and secured into a non-used
and non-heated cavity or pocket.
9. Reinstall the small left-side heat shield/ deflector.
ASSEMBLY OF THE RIGHT SIDE WITH HEADER
1. Insert the right-side header through chassis from below.
2. From above, install the gasket. Using the supplied 8mm lock washers over the factory exhaust bolts, start all the header bolts
prior to tightening, then evenly tighten all the header bolts to 20-25 ft./lbs.
3. Reinstall the spark plugs and tighten. Reinstall the spark plug wires. Check to ensure that they do not contact the header.
4. Reattach the EGR tube by reinstalling the (2) two 8mm bolts through the EGR plate.
5. Reinstall the dipstick and tighten the retainer bolt. Reinstall the right-side A.I.R. tube assembly.
6. Install the right-side pre-catalytic converter oxygen sensor into the right-side header collector.
NOTE
:
These Oxygen Sensor Wire Extensions are made long enough to use either the Oxygen Sensor with the 8” wire length or the
Oxygen Sensor with 12” wire length. Any excess wire length after installation should be looped and secured into a non-used
and non-heated cavity or pocket.
PRIOR TO FINISHING CHECK LIST
1. Inspect the steering shaft for proper installation.
2. Check to ensure that no wires will come in contact with the headers. Check to ensure that no (l/s and r/s) heat shields come in
contact with the headers.
3. Check to ensure that all emission A.I.R. hoses are clamped properly.
4. Check to ensure that any and all electrical connections that were disconnected are properly reconnected.
5. Check to ensure that all oxygen sensor wires are looped and secured in a non-used and non-heated cavity or pocket.
6. NOTE: Y-PIPE PART NUMBER 11133YFLT OR 11133Y-1FLT IS RECOMMENDED TO BE USED AND INSTALLED WITH
HEADER P/N 11133FLT OR 11133-1FLT.
7. Reconnect the battery. Start the car and check for leaks.
11133-3901FLT
Revision Date: 2-12-18
