The Top Ford Mustang Header Install Mistakes Owners Make — and How to Avoid Them

So, you want to throw some new headers on the Stang. While you may have read an article or forum post that says that Mustang headers = gains... it's not as simple as that. In fact, there are tons of mistakes you can make when installing headers on your Mustang, and some of them will lead to melted wire harnesses and expensive repairs. The good news is that you've come to the right place. We know you want to get to the fun part of choosing the best long or short tube headers, but stick around and make sure you don't make any costly mistakes.

Common Ford Mustang Header Install Mistakes

Unfortunately, installing Mustang headers isn't always a simple job. For this reason, you need to ensure that everything is tightened, aligned, and properly sealed. You also need to choose the right headers, wrap parts to avoid melted wires, and much more. Learn about some of the most common mistakes below.

Choosing the Wrong Headers

First and foremost, it's important to choose the right headers, and this isn't as simple as you may initially think. That said, the biggest decision you have to make is whether or not you want to go with shorty or long tube headers. Starting with short tube headers, also known as shorty headers, these headers are smaller and easier to work with. While you won't get the gains that long tube headers provide, they work well with OEM exhaust systems and components, so you don't have to worry about making too many changes. Finally, short headers are more affordable than long tube headers, so keep this in mind. On the other hand, you have long-tube headers. These are headers that take up a little more space under the hood. You'll gain a lot of power from these headers, but you do have to spend a little more on them. While long-tube headers sound and perform well, you may need to replace other exhaust components to ensure that they fit. Sensor locations may also need to change or be adjusted.

Not Checking the Hardware

Look, checking the hardware might sound self-explanatory, but you need to know where to look. You need to make sure gaskets are properly sealed, bolts are torqued to the right specs, and that the exhaust doesn't shift or warp during heat cycles. Sometimes, you won't know if there are problems right away, so make sure you keep an eye on the system for a few heat cycles. Also, keep your ears open for any ticking sounds and your nose open for any exhaust fumes. These are warning signs that your exhaust system is leaking, and this can result in power loss.

Alignment and Fitment Problems

Have you looked under the hood of your Mustang GT recently? If so, you've probably noticed that it's a little crowded down there. In fact, even V6 and EcoBoost Mustang variants can quickly become crowded if you throw the wrong headers on your Stang. What's more, if your headers aren't properly aligned, you may run into a handful of problems. You can end up with:

• Melted wire harnesses
• Issues with your steering components
• Touching the frame or other exhaust parts that result in rattling sounds or vibrations
• Exhaust leaks

To avoid these issues, inspect your exhaust system for any fitment, uneven hangs, and its proximity to other parts in the engine bay.

Forgetting to Update Your ECU

If you want your Mustang’s exhaust to perform properly, it's important to update your ECU and oxygen sensors. When you install new headers that improve exhaust flow and add power, you'll want to tune your Stang’s ECU to account for this. If you want to maximize the power that your new headers provide, you'll need to tune your Mustang or you’re making the mistake of leaving power on the table. Also, don't forget about O2 sensors. These are sensors that send readings to your ECU, and if they get damaged during the installation or they need to be moved around, they'll throw a code that results in a Check Engine Light. In fact, you can even end up failing emissions during an inspection. Luckily, plenty of options are available when you shop online.

Avoiding the Biggest Mustang Header Installation Mistakes

The simplest way to avoid the biggest Mustang header Installation mistakes is to choose the right headers. While it may seem overwhelming at times, the good news is that we always have your back when you shop online. Our sales techs will help you find the perfect headers for your Mustang, and they can make recommendations based on where you want to take your Mustang.