There’s a common misconception that installing an aftermarket exhaust on your Isuzu Dmax is just going to make your vehicle sound really loud. But that can’t be further than the truth. A quality aftermarket Dmax exhaust system will provide you with a number of benefits, and louder exhaust note is just one of them. Plus, you can even choose an exhaust that doesn’t change it whatsoever. It’s completely your call.
While stock exhaust systems are totally fine and functional, aftermarket exhaust systems allow you to unlock some extra horsepower from your engine and get better mileage in some cases. That being said, here’s how stock and aftermarket exhausts compare to one another and what things you’ll need to consider when shopping for an aftermarket Isuzu exhaust.
Aftermarket vs Stock Exhausts
The mufflers used in your stock exhaust are specifically designed to provide a low-noise operation by sacrificing some exhaust gas flow. On the other hand, aftermarket exhausts use mufflers with less flow-restricting baffles and chambers in them.
Next, aftermarket Dmax exhaust systems feature mandrel-bent tubing, which eliminates the restrictive bends found in stock exhausts by forcing the tubing to keep its round profile around the bends. This results in significantly improved gas flow. By using free-flowing mufflers and mandrel-bent tubing, aftermarket exhaust systems increase torque, horsepower and in some cases – fuel economy.
If you want your Isuzu to have an aggressive tone, aftermarket exhaust systems are the way to go. This is simply due to the fact that unlike your almost silent stock mufflers, aftermarket mufflers are engineered to produce a deep rumble.
Things to Consider When Buying Aftermarket Exhaust Systems
When looking for a Dmax exhaust system, you need to first determine how much of your stock exhaust you want to replace. In many cases, you’ll be able to pick from manifold/header back, cat-back or DPF back if you have a diesel, and axle-back exhaust systems. Usually, the more stock tubing you replace in favour of high-flowing mandrel-bent tubing, the more performance you’ll get out of your vehicle.
However, depending on the type of vehicle you have and your skillset, installing a manifold/header back system can be straight out impossible or very labour intensive. If that’s the case, you can just get a cat-back system, which won’t provide as much performance benefits, but you’ll still notice a difference. Alternatively, you can get an axle-back system, which doesn’t improve performance and mileage, but it does improve how your vehicle looks and sounds.
Then, you’ll have to consider the materials the aftermarket exhaust is made of. If you live in a dry area of the country, aluminised tubing that comes with most exhaust systems will be suitable. But if you live in humid areas where road salt is used or in a coastal area, you’ll need a stainless steel aftermarket exhaust.
Worth noting is that not all stainless steel is made equal. There are two popular grades of stainless steel used for manufacturing exhausts – T304 and T409. Most exhaust systems are made using T409 stainless steel which is corrosion and rust-resistant. T304 stainless steel is another popular grade of steel used for manufacturing exhausts, and it’s arguably one of the strongest materials available today.
While some people want to have the loudest, most obnoxious system, the sound aftermarket exhaust systems produce can quickly become annoying, especially if you’re commuting long distances with your vehicle. That being said, it’s important to have an idea of how loud a particular aftermarket exhaust system might be once you install it on your Isuzu. Luckily, there are tons of sound clips you can listen to online and customer reviews you can read, so you have an idea of what you’re getting yourself into.
Aftermarket exhaust systems are usually available with and without catalytic converters. Most header/manifold back and cat-back exhaust systems will include a catalytic converter, but you can choose to get one without. However, you’ll want the exhaust system to have a catalytic converter almost 99% of the time to make sure your vehicle passes emission inspections.
If you have a diesel Dmax, you’ll also want to make sure the aftermarket system you buy includes a DPF. If you worry about the catalytic-converter robbing you of horsepower and torque, you’ll be glad to know you can find high-flow catalytic converters that cleanse the harmful emissions from your engine much faster than your stock catalytic converter would.
And lastly, if you’re worried about the dealership voiding your Dmax’ warranty because you’ve installed an aftermarket exhaust system – you have no reason to. Your dealership can’t void your vehicle’s warranty unless they can prove the aftermarket exhaust system you’ve installed is the initial cause of the problem. However, give your dealership a call and ask them to make sure equipping your Dmax with an aftermarket exhaust will keep your warranty intact to have peace of mind.