Unlocking the Power: How to Convert Your Subaru 2.5 NA Engine to Turbo

Subaru cars have a dedicated loyalty following, with a growing number of enthusiasts looking to boost their car’s performance. Converting your Subaru 2.5 NA engine to turbo is a great way to take your driving experience to the next level. However, the process can seem daunting, especially if you’re not familiar with engine tuning and modification. In this guide, we’ll walk you through everything you need to know to successfully convert your Subaru 2.5 NA engine to turbo.

Why Convert Your 2.5 NA Engine to Turbo?

The benefits of converting your 2.5 NA engine to turbo are many. Turbochargers increase the amount of air flowing into the engine, which, in turn, results in a more powerful combustion process. This increase in power leads to improved acceleration, higher top speeds, and an overall better driving experience. Additionally, turbocharging can add significant value to your car, making it more attractive to potential buyers when you decide to sell.

Components Needed for Turbo Conversion

Before you can convert your Subaru 2.5 NA engine to turbo, you’ll need to gather a few essential components. These components include:

  • Turbocharger: The turbocharger is the heart of your engine’s turbocharging system, responsible for compressing the air that flows into the engine.
  • Exhaust Manifold: This part bolts onto the engine’s cylinder head and routes exhaust gases to the turbocharger.
  • Intercooler: The intercooler cools the air that passes through the turbocharger before it enters the engine. Cooler air is denser, providing more power when combusted.
  • Wastegate: This valve controls the amount of boost pressure that is generated by the turbocharger. Without a wastegate, the engine could overboost, causing serious damage.
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Installation Process

Installation can be time-consuming and challenging, but it’s essential to get it right to ensure that your engine runs smoothly. Here’s a brief overview of the turbo conversion process:

  1. Start by removing the engine’s air intake and exhaust.
  2. Install the new exhaust manifold onto the engine, followed by the turbocharger.
  3. Connect the intercooler and wastegate to the turbocharger.
  4. Tune the engine to accommodate the increase in power generated by the turbocharger. This step is critical to ensure the longevity of the engine.

The installation process can vary depending on the make and model of your car. Therefore, it’s essential to have a basic understanding of engine mechanics or seek professional assistance if necessary.

Challenges and Potential Drawbacks

While turbocharging your Subaru 2.5 NA engine can provide significant benefits, there are potential challenges and drawbacks to consider. These include:

  • Additional stress on the engine: Turbochargers place more stress on the engine, which can result in a shorter lifespan and increased maintenance costs.
  • Increased fuel consumption: Turbocharged engines consume more fuel than non-turbocharged engines, which can lead to increased running costs.
  • Need for specialized knowledge and tools: Turbo conversion requires specialized knowledge and tools, which may not be readily available to everyone.


Should I install a turbocharger myself?

Installing a turbocharger is a very complicated process and requires in-depth knowledge of engine mechanics. It is essential to work with a professional if you are not comfortable with engine tuning and modification.

How much does it cost to convert my 2.5 NA engine to turbo?

The cost of conversion depends on the components you choose and the cost of installation. Generally speaking, you can expect to spend between $2000 to $4000 or more.

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Will converting my 2.5 NA engine to turbo affect my car’s warranty?

Turbo conversion is a modification to your car’s engine. Therefore, it can affect your car’s warranty. It’s essential to consult with your car’s manufacturer to find out their policy on engine modifications.


Converting your Subaru 2.5 NA engine to turbo can provide significant benefits and improve your driving experience. However, it’s essential to understand the process and potential difficulties before you embark on this journey. Always work with a professional if you’re not comfortable with engine tuning and modification. With the right components and an understanding of the process, you can unlock the full potential of your Subaru.

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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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