Unlocking the Speed Potential of Your Subaru Legacy: A Beginner’s Guide to Performance Upgrades

Subaru Legacy is a reliable and popular sedan for both daily use and long drives. What if you’re looking to go even faster or give your Legacy more power? In this article, we’ll explore the different performance upgrades available for the Subaru Legacy and how to safely and effectively implement them.

Performance Upgrades for Subaru Legacy

There are a variety of performance upgrades available for Subaru Legacy drivers. By upgrading the engine, suspension, and exhaust, you can increase horsepower, torque, and agility. Here are some popular options:

Engine Upgrades

Upgrading the engine is the most significant way to boost the power of your Subaru Legacy. Subaru offers several engine options, but if you’re looking to make your Legacy fast, the most popular ones are the 2.5-liter and 3.6-liter six-cylinder engines.

You can also add a turbocharger or supercharger to your engine. Turbochargers force the air into the engine, while superchargers use a belt or chain to drive a compressor that delivers compressed air to the engine. Both of these upgrades will give your Legacy more power and speed, but they can also be expensive and complicated to install.

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Suspension Upgrades

Upgrading the suspension can improve handling and agility, making your Legacy more enjoyable to drive. Popular options include replacing worn-out components with stiffer, more durable parts or installing coilovers, which allow you to adjust the ride height and stiffness of the suspension.

Exhaust Upgrades

Upgrading the exhaust system can improve both performance and sound. High-performance exhaust systems are built with larger-diameter pipes and smoother bends than stock systems, which allows the exhaust gases to flow more efficiently. This can increase horsepower and torque. Additionally, a performance exhaust system can give your Legacy a louder, more aggressive exhaust note than the factory system.

Risks and Challenges of Performance Upgrades

While performance upgrades can enhance the speed and performance of your Legacy, they may also bring about a host of challenges. Here are some important considerations:

Warranty and Insurance

Aftermarket modifications can often void your Subaru warranty. Additionally, insurance companies tend to charge higher premiums for modified vehicles, and some may not offer coverage at all.

Installation and Maintenance

Performance upgrades require expert installation, and if not installed correctly, they can negatively impact the performance of your vehicle. It’s also essential to make sure your upgrades are regularly serviced to ensure they continue operating safely and efficiently.

Safety and Compliance

With performance upgrades, it’s important to consider the safety and compliance of your vehicle. The brake system and the tires are crucial components when driving at high speeds, and it’s important to ensure they can handle the added power. Additionally, in some areas, modified vehicles must pass scrutiny from locally designated agencies like emissions testing facilities.

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Tips for Safe and Reliable Upgrades

Here are some tips for those interested in making performance upgrades to their Subaru Legacy:

Research Your Options

Take the time to weigh your goals and options before deciding on any performance upgrades. Consider the long-term benefits and drawbacks and seek the advice of experts in the industry.

Choose a Reputable Installer

When it comes to performance upgrades, only trust a reputable and experienced installer. Look for a technician with previous experience working specifically with Subaru vehicles and performance modifications.

Be Prepared for Additional Costs

Performance upgrades can come with an additional cost, and it’s important to factor in these costs before deciding on an upgrade. In addition to the cost of the upgrade and its installation, other costs such as insurance, servicing, and maintenance are also crucial.

Never Sacrifice Safety and Reliability

It’s important to understand that modifications intended to increase power, like a turbo or supercharger, can have a significant impact on the reliability of your vehicle. Don’t sacrifice safety and reliability for performance.


Q: Will Upgrading my Subaru Legacy’s engine void the warranty?

A: In many cases, yes. However, some dealerships will still honor warranties, even with modifications. Before making any modifications, always read the warranty to understand what may or may not void it and how to proceed.

Q: Can I install a turbocharger myself?

A: While it is not impossible to install a turbocharger yourself, we strongly recommend that you seek out a professional installer who can ensure proper fitment, tuning, and engine compatibility.

Q: Will performance modifications make my vehicle street legal?

A: In most cases, yes, modifications will still make a car legal for street use, as long as they comply with local laws and regulations. Check your local laws and regulations to confirm.

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Subaru Legacy is a great vehicle for everyday driving, but with the right upgrades, you can take its performance to the next level. Always consider your goals, research your upgrade options, and work with qualified installers and services to ensure safe and reliable performance modifications. When done appropriately, these upgrades can provide you with an entirely new driving experience.

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Alton Brobst

As a longtime Subaru enthusiast, Alton brings a wealth of knowledge and experience to our blog. From his early days of tinkering with engines to his current role as a certified Subaru technician, Alton has seen it all when it comes to Subarus. When he's not working on cars, he enjoys hiking and exploring the great outdoors.

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