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/InstallationHydraulic Variable Valve Timing Actuator Inspection
WARNING:
A hot engine can cause severe burns. Turn off the engine and wait until it
is cool before servicing.
CAUTION:
Do not disassemble the hydraulic variable valve timing actuator because it
is a precision unit.
1. Disconnect the negative battery cable..
2. Rem ...
Sas Control Module [Standard Deployment Control System]
Purpose
The SAS control module controls the air bag system operation.
Function
During a frontal collision, the SAS control module controls the following
air bag module operation (deployment).
Driver-side air bag module
Passenger-side air bag module
...
Front Buckle Removal/Installation
Driver-side
1. Disconnect the negative battery cable and wait for 1 min or more..
2. Remove the front seat..
3. Disconnect the front buckle connector.
4. Remove the bolt.
5. Remove the front buckle.
6. Install in the reverse order of removal.
Passenger-side (with buckle switch) ...