In a four-stroke engine, the exhaust cycle is the last step in the process when the burned gasses are expelled from the engine.
The exhaust valve opens at the beginning of the exhaust stroke, and then the piston pushes the burnt gasses out of the cylinder. If there is any resistance that the piston has to push against to force the exhaust gasses out, power is wasted. This is known as back pressure.
Therefore, the goal is to get the burnt gasses out of the engine and exhaust system as efficiently as possible. These gasses travel through the exhaust port into the exhaust manifold, then travel through the exhaust pipe to the catalytic converter and muffler, and finally vent to the environment.
Any obstacles or severe "bends" in the system can affect back pressure, slowing the flow of exhaust gasses. Therefore, an exhaust system that reduces back pressure improves efficiency and can create additional power output.
Tuned to deliver added low-end/mid-range torque and improved horsepower. This increases performance in acceleration.
Click on the hoptspots below to learn more about specific features:
TRD exhaust systems reduce back pressure by getting burnt gasses out of the engine and exhaust system efficiently, therefore creating additional power output.
Dual wall construction preserves the bright polish stainless finish from discoloring heat.