Subaru Performance: Choosing the Right Size Pipe for Your Throttle Body

Are you a proud Subaru owner who is looking to make some upgrades to your vehicle’s engine performance? One of the modifications that can greatly enhance your car’s performance is upgrading your throttle body. However, with so many options and sizes available in the market, it can be challenging to know what size pipe is best suited for your Subaru’s throttle body. In this article, we will guide you through the essential information you need to make an informed decision to upgrade your throttle body.

What is a Throttle Body and How it Affects Engine Performance?

A throttle body regulates the airflow entering the engine and controls the amount of air that mixes with the fuel. It is a critical component that allows the engine to respond to gas pedal inputs by controlling how much air enters the engine, which directly affects the engine’s power output.

Upgrading your throttle body can increase the airflow, leading to improved throttle response. Additionally, it can increase the horsepower and torque of the engine overall.

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What Size Pipe Should be Used on a Subaru Throttle Body?

One of the most frequently asked questions regarding Upgrading a Subaru’s throttle body is what size pipe is ideal. The best size for a Subaru throttle body typically ranges between 2.5 to 3.0 inches in diameter.

Choosing a larger pipe diameter means that more air can flow into the engine, leading to a higher power output. However, It’s important to keep in mind that the size of the pipe should be selected carefully. If the pipe diameter is too large, it may negatively affect the engine’s performance by reducing the air velocity.

Different Types of Throttle Bodies Available for Subaru

When it comes to selecting a throttle body for your Subaru, various options are available in the market. Here are some of the most popular ones:

  • OEM Throttle Body: The Original Equipment Manufacturer throttle body is the one that came with your Subaru from the factory. While it’s an excellent choice, upgrading to an aftermarket throttle body can provide you with better performance gains.

  • Billet Aluminum Throttle Body: Billet Aluminum throttle bodies are engineered to maximize the engine’s overall performance, and they’re a popular choice among many Subaru enthusiasts.

  • Drive-by-Wire Throttle Bodies: Drive-by-Wire throttle bodies are electronic, and they process the driver’s gas pedal inputs before allowing air into the engine. They’re commonly used in newer Subaru models and provide a seamless driving experience.

Benefits of Choosing the Right Size Pipe for the Throttle Body

Choosing the right size pipe for your Subaru throttle body can improve the engine’s overall performance. An optimal-sized pipe can help:

  • Increase Horsepower
  • Enhance Torque
  • Improve Throttle Response
  • Improve Fuel Efficiency
  • Provide a Better Driving Experience
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Installation Process for the Throttle Body

Installing a new throttle body for your Subaru can be a bit challenging for beginners, but it’s manageable. Here are the general steps to follow:

  1. Disconnect the battery
  2. Remove the old throttle body
  3. Install the new throttle body
  4. Reconnect the battery
  5. Test the new throttle body

If you’re not confident of installing a new throttle body yourself, you can always consult a professional mechanic to help you with the installation.

Frequently Asked Questions

1. What is the best brand for a Subaru Throttle Body?

Some of the most popular and trusted brands for Subaru throttle bodies include Cosworth, Mishimoto, and Skunk2.

2. How do I know if my throttle body needs an upgrade?

You can check your throttle body’s performance using a dynamometer or by noticing if your car’s engine is sluggish. If you’re unsure, consult a professional mechanic to help diagnose your engine’s issues.

3. Is upgrading a throttle body worth it?

Upgrading your throttle body is an excellent way to improve your Subaru’s overall engine performance and give you a better driving experience. It’s a worthy investment for those looking to maximize their vehicle’s potential.


A throttle body upgrade is an excellent modification to improve your Subaru’s engine performance. When upgrading, always choose a pipe diameter between 2.5 to 3.0 inches and consult with an expert if you’re unsure. Additionally, always purchase from trustworthy brands and ensure proper installation to maximize the engine’s potential. With the right upgrades, your Subaru can reach its fullest potential for unmatched performance.

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Billy Covington

With a passion for all things automotive, Billy is our go-to expert on Subaru performance upgrades and modifications. He's been featured in several car magazines and blogs, and his extensive knowledge and expertise make him a valuable member of our team. When he's not working on cars, he enjoys playing guitar and writing music.

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