Is A Dual Exhaust Worth It? Here's How It Affects Performance

Car design can be subtle, but one thing that often screams performance is a dual exhaust setup. It's so ubiquitous that some EVs even mimic the look and sound. Of course, the visual appeal of dual exhaust doesn't itself actually add any horsepower. Let's break down the fact from the fiction.

The general idea here is very simple. Instead of routing all of an engine's exhaust gas through a single pipe, a true dual exhaust (a term we'll come back to shortly) uses two separate paths. Double the flow can make it easier on the engine to expel spent gas and inhale more, particularly at high engine speeds. That's the main focus, but there's a big caveat in this space.

A true dual exhaust is different from the vast majority of what most cars with dual tailpipes really have today. Most production cars that have dual tailpipes actually have a single exhaust pipe that feeds into a muffler, then splits after the fact. That might look great, but the performance benefits fall far short.

The word 'can' is doing some heavy lifting there. Engines are, in many ways, air pumps, and the more air one can pump, the more power an engine can make. That said, more air flowing through the system only helps if the engine can use that additional oxygen. Taking a car with a single exhaust and fabricating a new dual-exhaust setup doesn't automatically add power. You need the right mix of components and fuel delivery.

As Meineke explains, exhaust upgrades can improve horsepower and fuel efficiency, although the results vary considerably. A properly sized single exhaust can outperform a poorly designed dual setup. Pipe diameter, bends, mufflers, catalytic converters, and even the engine's tuning all play a role. On top of that, exhaust system science has come a long way.

Today, most automakers already make their factory exhaust systems quite efficient. That makes gains even harder to come by. Furthermore, while a dual exhaust upgrade could add more power overall, that power might only be available at the top of the rev range, where you'll almost never notice it on a daily commute.

The answer here relies almost entirely on one's goals. If you're chasing horsepower, dual exhausts can be worthwhile, especially if you've modified the engine or plan to. That said, don't expect some gigantic shift in power based on simply adding a second exhaust pipe. It'll always make a bigger impact with proper tuning and good air-to-fuel mixtures.

Sound is perhaps the more emotional reason to go this route. Changing things like mufflers, resonators, and exhaust routing can produce very different engine notes. Louder isn't always better, though, so if possible, see if you can find clips of your car with the exhaust setup you're considering so you can get some sense of what you'll be living with.

Ultimately, if your car already has an efficient exhaust, the performance improvement might not justify the expense. If you want a different soundtrack, though, there's nothing wrong with that. Just don't confuse a louder exhaust with a faster car.