Single vs Dual ExhaustLast Updated August 4, 2019 | Alison Smith
When people think of making an aftermarket modification to their vehicle, many times upgrading the exhaust system is at the top of the list. Although there are several types of exhaust systems available, the main factor to consider is a dual exhaust vs single exhaust. Before we delve deeper into the specifics, here’s a basic overview of how an exhaust system functions.
What is Exhaust?
After the combustion process takes place in an engine, gas is produced. This gas needs a way to escape the vehicle in order to bring more cool air into the engine and to expel the toxic fumes. Exhaust gases escape the engine through the exhaust valve, making their way into the exhaust manifold. In the exhaust manifold, exhaust from all of the cylinders is collected and sent to the catalytic converter to be cleaned. As some of the exhaust gases are noxious, the catalytic converter helps break down the gases so they are less toxic. The less harmful gases then travel through the exhaust pipe into the muffler, which quiets the sound by reflecting the engine’s sound waves and canceling them out. All of these components that help the toxic gases escape the engine are components of the exhaust system.
Dual Exhaust vs Single Exhaust Systems
There are several types of exhaust systems out there, but the two main systems are single and dual exhausts. Single exhausts are found on most vehicles and send the exhaust gases through one sole pipe. Usually found on vehicles with a six-cylinder engine or larger, dual exhausts will send the gases through two pipes. Single exhaust systems, which are typically in a Y-pipe design, collect the gases from the manifold(s) into one singular pipe before traveling through the muffler and exiting the vehicle. Dual exhausts, on the other hand, have separate pipes connected to each manifold that then distribute the gases through two separate tubes. Although many vehicles appear to have a dual-exhaust system, many times it is just a dual exit exhaust or an exhaust with twin tips rather than an actual dual exhaust system. When many people think of dual exhausts, they may not be thinking of “true” dual exhausts that have two exit pipes. While single exhausts are associated with the Y-pipe formation, dual exhausts will usually either utilize an H-pipe or X-pipe design.
Single vs Dual Exhaust: Performance
Which provides better performance gains — a dual exhaust or single exhaust? Both accomplish the same task at hand. They both remove the exhaust fumes produced from the engine’s combustion process. Of course, a stock exhaust system isn’t going to provide as much benefits as an aftermarket system will. Whether you have a single exhaust or a dual exhaust, there are great aftermarket options that can help take your performance up a notch. Whether you decide to upgrade certain exhaust components or replace the entire system, investing in high-quality aftermarket parts will last longer and provide you with more power. Single exhaust systems still get the job done efficiently and effectively. You can upgrade your single exhaust system to larger diameter pipes that can allow for a greater exhaust flow and increased horsepower. The exhaust note will be enhanced along with performance. Some single exhaust systems even come with dual exhaust tips so you can achieve the same look as a dual exhaust without paying the higher cost. Upgrading your stock single exhaust will make a huge difference in both the appearance of your vehicle as well as the performance.
However, most would agree that a dual exhaust will give you better performance gains compared to a single exhaust system. Because the exhaust gases exit each manifold through two pipes rather than just one, they can exit the engine faster and provide additional horsepower gains. Dual exhaust systems help reduce back pressure, which can save energy and increase the engine’s efficiency for better gas mileage. When it comes to dual exhaust systems, an X-pipe will cross over in the middle and produce the least amount of power loss in comparison to an H-pipe. The H-pipe may not flow as well as the X-pipe, but it will have a higher amount of low-end torque. Although these differences might not hold much significance, it is worth nothing. The biggest differentiation between the H-pipe and X-pipe will be the exhaust note emitted.
Single vs Dual Exhaust: Sound
Although the sound an exhaust produces has nothing to do with performance and is purely aesthetics, it can be a deciding factor over whether you would rather have a dual or single exhaust. Factory single exhausts aren’t going to have that powerful sound right off the bat. However, many aftermarket single exhausts will produce a better, deeper sound note for a more commanding presence on the street. If you don’t really care for that loud exhaust note, there are exhausts out there that will have a modest sound or come with an optional silencer that you can install in order to mute the tone. In comparison to single exhausts, however, dual exhausts are going to have that loud, throatier sound note that muscle car enthusiasts crave. Depending on whether you opt for an H-pipe or an X-pipe, the design will largely determine what type of sound a dual exhaust will make. An H-pipe dual exhaust will emit that smooth, classic old-school muscle sound while the X-pipe will produce a louder, raspier tone.
Why Buy A Single Exhaust?
- More affordable
- Lighter weight
- Higher gas velocity
You may want to opt for a single exhaust if you are looking for a less expensive aftermarket system that will still give you additional performance benefits and increase the look of your vehicle. Although dual exhausts have a more aggressive style, there are plenty of powerful single exhausts out there that not only sound great but look great too. Some even have the same look as a dual exhaust but still function as a single exhaust. They will be more lightweight in comparison to dual exhausts. The exhaust gas will have a higher velocity in relation to dual exhaust systems. Vehicles with smaller engine sizes typically feature single exhausts, while dual exhausts are usually found in vehicles with larger engines.
Why Buy A Dual Exhaust?
- Provides more performance gains
- Increases exhaust flow
- Reduces back pressure
- Aggressive look
If you want to go all out, then a dual exhaust is definitely for you. These aggressive, powerful exhaust systems will give you the performance gains you want and that desirable sound note to go along with the added power. Although dual exhaust kits will come at a higher cost, the price is worth it. Even though the velocity of the exhaust gas flow may be slower, the overall flow will be higher. For big, turbocharged engines, a dual exhaust will help you keep everything cool for the best performance possible. Because they stay cooler, be wary of condensation buildup that can cause rust later down the road.
CJ Pony Parts offers exhaust systems for a wide variety of vehicles ranging from the Ford Mustang to the Jeep Wrangler. Whether you’re looking to upgrade your single exhaust or dual exhaust system, be sure to check out the extensive online catalog!
Sources: yourmechanic.com, doityourself.com | Image Credit: Four Wheeler Network, Ford
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