Purpose, Function
By lengthening the exhaust passage, the transmission of exhaust pressure waves to other cylinders can be delayed, and the amount of gas exhausted from a cylinder and forced back inside the combustion chamber is reduced By reducing the residual gas, the temperature inside the combustion chamber is reduced and the occurrence of knocking even at a high compression ratio is inhibited.
Construction
The exhaust manifold is installed to the rear of the engine. In addition, the catalytic converter (WU-TWC) is integrated (WU-TWC).

When the No.1 cylinder is at the intake stroke, the No.3 cylinder is at the exhaust stroke. By inducing the high temperature gas exhausted from the No.3 cylinder into the No.1 cylinder, the high temperature gas in the No.1 cylinder remains. If the amount of residual gas is high, the temperature in the combustion chamber rises and knocking can easily occur. With the 4-2-1 exhaust system, the transmission of exhaust pressure waves between each cylinder is delayed by the long exhaust pipes.

Exhaust System Removal/InstallationBrake Hose (Rear) Removal/Installation
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
3. After installation, add brake fluid, bleed the air, and inspect for fluid
leakage..
1
Brake pipe
2
Clip
3
Bolt
...
Rear ABS Wheel Speed Sensor Inspection [2 Wd]
Installation Visual Inspection
1. Inspect the following items:
If there is any malfunction, replace the applicable part.
a. Excessive play of the ABS wheel-speed sensor
b. Deformation of the ABS wheel-speed sensor
Clearance Inspection
1. Remove the ABS wheel-speed sensor.
2. M ...
Warning Sound is Activated
Lights-On Reminder
If lights are on and the ignition is switched to ACC or the ignition is switched
off, a continuous beep sound will be heard when the driver's door is opened.
NOTE
• When the ignition is switched to ACC,
the “Ignition Not Switched Off (STOP) Warning Beep” ove ...