Why is a dual-exhaust system better?
Have you ever wondered what the point of a dual-exhaust system on a car is? Why is a dual-exhaust system better? We will try to tackle some of the science behind this as we explore the inner workings of the modern combustion engine.
What do auto manufacturers do to increase engine power?
Most people know that if you want to increase power, you need to increase your intake. This is why turbochargers and superchargers are popular. However, that is far from the only thing that can be done. There are a lot of other variables at play here.
One way to improve power is to make it easier for your engine to flow air through it. A lot of work has gone into engineering your intake manifold to allow air to slide in, mix with fuel, and cram itself into the engine. The same amount of work is done to your exhaust manifold.
The faster you can get those exhaust gases out of your engine the better. Not only does it make your engine operate better and burn cleaner, but it also allows your engine to run cooler. How do you get those exhaust gases out of your engine? In simple terms, the bigger the hole, the better.
How does a dual-exhaust system increase power?
To put it simply, a dual-exhaust system is less restrictive to your engine. Less restriction generally means more power. It’s the difference between trying to exhale through one straw or two. Many exhaust manifolds are even built to essentially suck the exhaust out of each cylinder to assist in this process.
Because of this, most vehicles would improve performance if the exhaust was cut off right after the manifold. Do not do this though. You’ll have more power, but it will be loud, it will pollute, it’s illegal, and the untamed exhaust gases could suffocate you in the cabin.
Are there fake dual-exhaust systems?
A true dual-exhaust system collects your exhaust gases in two separate chambers and runs them through two separate catalytic converters, two mufflers, and then out the back. This is the best way to do it, but it is not the most affordable system to build.
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As such, many modern cars collect the exhaust gases into one pipe, run them through one converter and one muffler before splitting into two exhaust tips in the back. This still has some benefits as it can be less restrictive overall, but it is not nearly as optimized as two separate systems.