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/InstallationGlass/Windows/Mirrors
Outline
The following glass has been adopted.
Windshield
Front door glass
Rear door glass
Rear door quarter glass
Quarter window glass
Rear window glass
Outer mirror glass
The following mirrors h ...
Rear Scuff Plate Removal/Installation
1. Take the shaded area shown in the figure, detach tab A while pulling the rear
scuff plate in the direction of the arrow (1) shown in the figure, then detach hook
B, clips C, pins D while pulling in the direction of the arrow (2).
2. Take the shaded area shown in the figure, detach tab E whi ...
Front Seat Cushion Trim Removal/Installation
WARNING:
Handling a side air bag improperly can accidentally operate (deploy) the
air bag, which may seriously injure you. Read the service warnings/cautions
in the Workshop Manual before handling the front seat (side air bag integrated)..
If the sliding mechanisms on both side ...