LG Motorsports LG C5 Pro Long Tube Headers - Manual (Page 3)

Once under the car it is now time to start installing the rest of the pipes. The front
02 sensors should be installed into the headers and tightened down. You will need to
drill two ¼” holes at the front of the center plate to hold each 02 sensor wire with a zip tie
to keep them from burning on the headers as shown in Figure 1. Please note, it may be
necessary to unclip part of the factory harness to give enough slack and free play in the
wires. **NOTE FOR 1997 to 2003 Models**: These cars will only use two 02 sensors at
this time. The sensors have a built in heater circuit to bring the sensors up to operating
conditions sooner and enter the car into closed loop sooner. The early cars have a weak
heater in their front sensors. We have found best results to use the rear sensors in the
front location by using the supplied adapter harness. Rear sensors should be removed
inside the computer or a new set of rear sensors should be used in the rear location.
Figure 1: Front 02 sensor wire hold down.
The catalytic converters (or off-road pipes) slip into place just after the headers.
Please slide the clamps onto the pipes as you work your way back so that you can come
back later and tighten everything down as you go once everything is aligned. The X pipe
is next in the install. Before installing the X pipe please transfer the rear stock 02 sensors
and place them into the X pipe. Note the location of the 02 sensor holes and place them
closest to the catalytic converters (or off-road pipes). At this time it is also necessary to
drill a hole in the plate just above the exhaust. This hole will allow the 02 sensor wires
from the rear to feed up above the exhaust and not become burned on the exhaust as
shown in Figure 2. We drill a 1 to 1 ½” hole in the plate to allow the wires to feed above
the plate as shown in the picture below. Please run the wires through this hole and above
the exhaust while installing the X pipe for easiest install. Also make note of the angle of
the 02 sensors themselves. They should lay very close to the X pipe as to give the most
clearance, if not the bungs may have to be ‘tweaked’ a bit to lay them over.