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Mustang Intake Upgrade Guide

Written By: Lisa Schaefer

You can improve your Mustang’s power and performance by feeding more air into the engine. The easiest way to do this is by upgrading the intake system. By upgrading the intake system, you will be able to throw more fuel into your engine and up the amount of power you are making. This guide will go over what you need to know about Mustang Intakes.

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What Is A Mustang Intake System?

A Mustang intake can be a vague name applied to either the intake manifold which sits atop of the engine or it can be applied to the cold air/ram air intake system that sucks in outside air into your engine. The entire air intake process for your Mustang consists of:

-The air intake (either cold air intake or ram air intake)
-Throttle body
-Intake manifold

Cylinder heads can also be considered part of the intake process, but for the sake of staying on topic, this guide will mainly address the three areas listed above along with forced induction setups.



Upgrading Your Mustang’s Air Intake System

The air intake is where all of the air goes into your engine. It consists of a filter and a tube that connects to your throttle body. There are cold air and ram air intakes. Ram air intakes are less common, short in length and have a wide/large filter that tries to ram a bunch of air into the engine. Cold Air Intakes are designed to have a more open design and a longer tube that can grab cool air flowing in through the front of your Mustang and are the more common upgrade for all Mustang owners.

Cold air Mustang intakes come in a variety of different sizes, with larger sizes (anything really over 95 MM) being better suited for boosted/forced induction engines. Cold air intakes can net you anywhere from 10-35 HP depending upon the intake and the manufacturer as well as the overall size.

Not all cold air intakes require you to tune your Mustang, however you will almost always get more power by pairing a cold air intake with a custom tune.



Aftermarket Mustang Throttle Bodies

Throttle bodies can be one of the main choke points in a Mustang’s exhaust system as all of the air your intake sucks in has to pass through the throttle body, condensing before it goes into the intake manifold. When looking to achieve higher power numbers and improved acceleration/throttle response, a throttle body is often the key.

For low key, builds, throttle bodies are often not needed, but when you starting trying to go for bigger power increases you will need to upgrade the throttle body. If you go to a forced induction setup with a supercharger, turbocharger, or even nitrous, you will definitely need to replace the stock throttle body with a much wider one.

Mustang throttle bodies can add anywhere from 5-20 HP depending upon the size and your other supporting mods. Not all throttle bodies need to be tuned, however it will without a doubt deliver more power and a much smoother throttle response with a custom tune.


Differences Between Single & Dual Bladed Throttle Bodies

Throttle bodies will have either a single moving opening or dual openings/throttle blades. Typically, single blade throttle bodies (like what is found on the stock setup) are more efficient as they have less impeding the flow of air into the engine; however, large dual blade throttle bodies can perform well and offer an increase in power as well. Single blade bodies tend to make more power than duals, but it really varies on a case-by-case basis.

There is also a difference in single blade throttle bodies between circular and oval throttle bodies. Circular ones are what the Mustang has stock and offer quick, snappy throttle responses.

Oval Mustang throttle bodies are needed for supercharged applications and some intake manifolds and can suck in more air than a circular body. Oval bodies are like a fusion of a single circular blade and a dual blade throttle body, but without the air blockage.

Oval Mustang throttle bodies require more careful tuning as they can suffer from throttle hand, where the throttle body blade closes slower than you release off the throttle, hanging open.



Upgrading Your Mustang’s Intake Manifold

The intake manifold takes the air fed into it by the cold air intake and throttle body, distributing it to the engine’s cylinders. Intake manifolds have “runners” that are small tubes about the width of a golf ball that supply the air into the cylinders. Shorter runners tend to be better for low end torque and mid-range pull, but longer runners are better for overall peak HP, high end power, and increasing the redline.

Depending upon your Mustang and supporting modifications, intake manifolds can add anywhere from 15-50 HP and will almost always require you to tune your Mustang. While naturally aspirated Mustang engines will benefit from upgrading the factory intake manifold, centrifugal superchargers and turbochargers will benefit even more so as the improved air management of the intake manifold will yield even higher power numbers.



Superchargers & Mustang Intake Manifolds

Roots style or twin-screw blowers that set atop of your engine replace the intake manifold with the supercharger unit itself. While a turbocharger or centrifugal supercharger will greatly benefit from an aftermarket Mustang intake manifold, a roots style blower incorporates it into the design and packages everything into one unit. This is why roots style blowers tend to have a lot quicker of a response time to get into boost, which begins very low in the RPMs for those setups.


Porting A Mustang Intake Manifold

A popular modification that many enthusiasts have taken on themselves at home with a dremel tool is porting their stock or aftermarket intake manifold. Porting a manifold entails shaving down the inside of the runners to increase the diameter and the amount of air they can feed into an engine. Porting an intake manifold requires a steady hand, a specific set of tools, and a solid grasp of what you are doing.



5 Things to Consider When Choosing a New Intake Plenum

Switching out your throttle body is an easy and quick way to get more airflow into your Mustang’s engine. In almost every case, more airflow means more power, and what Mustang owner doesn’t want more rear wheel horsepower? Upgrading the intake plenum to a 70MM or a 75MM diameter on a stock or mildly modded Stang will certainly net you a couple extra ponies. Here are few things to consider when you’re in the market for a new intake plenum.

  • To maximize horsepower, match the size of your plenum with the size of your throttle body: 75MM typically works best for increasing horsepower in a 1999-2004 Mustang
  • When running any sort of power adder, a plenum of at least 75MM is desired to optimize airflow
  • Intake plenums are not one size fits all
  • Plenums are available in two finishes: polished aluminum and natural finish
  • To cut cost and increase power, consider getting a throttle body and plenum combo for your Mustang

Boss vs Cobra Jet Intake - Which Is Better?

  • The BOSS intake allows GT Mustangs to look visually identical under the hood to the BOSS
  • The BOSS intake is easily installed and does not require additional components
  •  BOSS intake manifolds feature clean lines and factory badges for enhanced visual appeal
  • COBRA JET intakes produce more top-end horsepower compared to the BOSS plenum, but sacrifice less low-end torque
  • COBRA JET intake manifolds are ideal for Mustang owners in major need of more airflow
  • COBRA JET intake manifolds require the use of a GT500 throttle body, intake tube, air filter, and other supporting mods

The Mustang BOSS 302 Intake Mainfold

As previously stated, the factory intake plenum works very well within the stock environment, however, not quite as well as the plenum provided to assist getting air into the BOSS 302. The best part about the BOSS intake plenum is it allows the GT mustangs from 11 to become visually identical under the hood to the BOSS. As an added bonus, the installation of this intake is fairly straightforward and does not require any other expensive components to be changed for the plenum to function at 100%. The clean lines and factory badges of the BOSS intake plenum make this an appealing modification not just for performance improvements, but also for those looking to improve the aesthetics under the hood as well.

As you can clearly see in this picture of the BOSS intake plenum, it has longer runners, and a top feed design for incoming air. This design allows for more air to flow into the cylinders for combustion and more power during high RPM situations, at a cost of slightly less performance down low in the RPM range when comparing it to the stock coyote plenum; typically, enthusiasts have seen an additional 27 peak HP with anywhere from no TQ loss to up to 10 TQ loss. It is also important to remember that in order to take advantage of the increased airflow the BOSS plenum provides, an aftermarket tune is required.


COBRA JET Intake Manifold

Another option for those with the need for even more airflow, and who also have a sufficient supply extra cash lying around, is the Cobra Jet Intake Plenum. This item is included on the factory produced 2013 Cobra Jet Drag Car, and is available as an add-on accessory to the coyote motor. It produces power very similar to the BOSS plenum but produces more top-end horsepower while sacrificing less low-end torque than the Boss Intake; users typically see around a 25 peak HP increase with no TQ loss. For those with a major need for more airflow, go with the Cobra Jet. 5.0’s with mild mods or minor plans to add power would be better suited with the Boss intake. The Cobra Jet plenum also requires the use of a GT500 throttle body, and other supporting mods such as an intake tube and air filter.

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