2011 Subaru WRX STI Sedan: Best Exhaust Options

by Alex Braham 48 views

Selecting the right exhaust system for your 2011 Subaru WRX STI sedan is a crucial decision that can significantly impact your car's performance, sound, and overall driving experience. Guys, let's dive into the world of aftermarket exhausts and explore what makes a particular system a great fit for your ride. From understanding the different types of exhausts to considering the materials used and the potential performance gains, this guide aims to provide you with everything you need to make an informed choice.

Understanding Exhaust Systems

When we talk about exhaust systems, we're referring to the components that channel exhaust gases away from your engine. The stock exhaust system in your 2011 WRX STI sedan is designed to meet specific emissions standards and noise regulations, which often means it's not optimized for maximum performance. Upgrading to an aftermarket exhaust system can unlock hidden horsepower and torque, while also providing a more aggressive and sporty sound.

Key Components of an Exhaust System

To truly understand what we're dealing with, let's break down the main parts of an exhaust system:

  • Headers (or Exhaust Manifold): These are the first components that collect exhaust gases directly from the engine cylinders. Aftermarket headers are often designed with equal-length runners to ensure each cylinder contributes equally to the exhaust flow, resulting in improved performance.
  • Catalytic Converter: This component reduces harmful emissions by converting pollutants into less harmful substances. However, it also restricts exhaust flow. High-flow catalytic converters are a popular upgrade that improves flow without sacrificing emissions compliance.
  • Mid-Pipe (or Intermediate Pipe): This pipe connects the catalytic converter to the muffler. It's often overlooked, but upgrading to a larger diameter mid-pipe can further enhance exhaust flow.
  • Muffler: This is the component responsible for reducing exhaust noise. Aftermarket mufflers come in a variety of designs, each offering a different sound profile. Some mufflers are designed for maximum flow and minimal sound reduction, while others prioritize noise control.
  • Tailpipe (or Exhaust Tip): This is the visible part of the exhaust system that exits the rear of the car. While it doesn't significantly impact performance, the tailpipe plays a role in the overall aesthetics of your vehicle.

Types of Aftermarket Exhaust Systems

There are several types of aftermarket exhaust systems available for the 2011 Subaru WRX STI sedan, each offering a different level of performance and sound enhancement:

  • Cat-Back Systems: These systems replace everything from the catalytic converter back to the tailpipe, including the mid-pipe and muffler. Cat-back systems are a popular choice for those looking to improve exhaust flow and sound without making major modifications to the emissions system. They typically offer a noticeable increase in horsepower and torque, as well as a more aggressive exhaust note.
  • Axle-Back Systems: These systems only replace the muffler and tailpipe, leaving the rest of the exhaust system intact. Axle-back systems are a more budget-friendly option that primarily focuses on improving the sound of your exhaust. While they may offer a small increase in performance, the primary benefit is the enhanced auditory experience.
  • Turbo-Back Systems: These systems replace the entire exhaust system from the turbocharger back to the tailpipe, including the downpipe, catalytic converter, mid-pipe, and muffler. Turbo-back systems offer the most significant performance gains, as they eliminate the restrictive factory components and allow for maximum exhaust flow. However, they may also require tuning to ensure proper engine management.

Factors to Consider When Choosing an Exhaust System

Choosing the right exhaust system for your 2011 Subaru WRX STI sedan involves several considerations. Here’s a breakdown of the key factors to keep in mind:

Performance Gains

The primary reason many enthusiasts upgrade their exhaust system is to improve performance. An aftermarket exhaust system with larger diameter piping and less restrictive mufflers can significantly increase exhaust flow, which in turn reduces backpressure on the engine. This can result in noticeable gains in horsepower and torque, particularly in the mid-range and top-end of the RPM band. When evaluating exhaust systems, pay attention to dyno test results and reviews from other owners to get an idea of the potential performance gains.

For example, a well-designed turbo-back exhaust system can add 20-30 horsepower to your 2011 WRX STI sedan. However, keep in mind that performance gains can vary depending on other modifications you have made to your car, such as an aftermarket intake or a performance tune.

Sound Quality

The sound of your exhaust is a subjective but crucial factor to consider. Some enthusiasts prefer a deep, throaty rumble, while others prefer a more aggressive and raspy tone. The type of muffler used in the exhaust system will have the most significant impact on the sound quality. Chambered mufflers tend to produce a deeper, more mellow tone, while straight-through mufflers offer a louder, more aggressive sound. Also, consider the amount of drone the exhaust system produces at cruising speeds. Drone can be annoying on long drives, so it’s important to choose a system that strikes a balance between aggressive sound and comfortable cruising.

Material and Build Quality

The material and build quality of the exhaust system will determine its durability and longevity. Most aftermarket exhaust systems are made from either stainless steel or aluminized steel. Stainless steel is more resistant to corrosion and rust, making it a better choice for those who live in areas with harsh weather conditions or salted roads. Aluminized steel is more affordable but less resistant to corrosion. Pay attention to the thickness of the steel used in the exhaust system, as thicker steel will be more durable and less prone to cracking or damage.

Emissions Compliance

Depending on your location, you may need to consider emissions compliance when choosing an exhaust system. Some aftermarket exhaust systems delete the catalytic converter, which is illegal in many states. If you need to maintain emissions compliance, look for exhaust systems that include a high-flow catalytic converter. These converters offer improved exhaust flow without sacrificing emissions control. Be sure to check your local laws and regulations before purchasing an exhaust system to ensure it is legal for street use.

Installation

The ease of installation is another important factor to consider, especially if you plan to install the exhaust system yourself. Some exhaust systems are designed as direct bolt-on replacements for the factory system, while others may require some modification or fabrication. If you’re not comfortable with performing the installation yourself, you may want to consider having a professional install the exhaust system. This will ensure that the system is properly installed and that there are no leaks or other issues.

Popular Exhaust System Brands for the 2011 Subaru WRX STI Sedan

Several reputable brands offer high-quality exhaust systems for the 2011 Subaru WRX STI sedan. Here are some of the most popular:

  • Invidia: Invidia is known for producing high-quality exhaust systems with excellent fit and finish. Their Q300 cat-back exhaust system is a popular choice for those looking for a balance of performance and sound.
  • Cobb Tuning: Cobb Tuning offers a range of performance parts for the WRX STI, including their cat-back exhaust system. Cobb exhaust systems are designed to improve exhaust flow and sound, while also maintaining emissions compliance.
  • Nameless Performance: Nameless Performance specializes in custom exhaust systems for the WRX STI. They offer a variety of muffler options, allowing you to tailor the sound of your exhaust to your personal preferences.
  • GrimmSpeed: GrimmSpeed is another popular brand that offers high-quality exhaust systems for the WRX STI. Their cat-back exhaust system is designed to improve exhaust flow and sound, while also being relatively easy to install.

Installation Tips

If you decide to install the exhaust system yourself, here are some tips to help you through the process:

  • Gather the necessary tools: You will need a socket set, wrenches, a jack, jack stands, and potentially a penetrating lubricant to loosen any rusted bolts.
  • Disconnect the battery: This is a safety precaution to prevent any electrical issues during the installation process.
  • Spray penetrating lubricant on the exhaust bolts: This will make it easier to remove the old exhaust system.
  • Support the exhaust system: Use jack stands to support the exhaust system while you are removing it.
  • Follow the manufacturer’s instructions: Each exhaust system will come with specific instructions for installation, so be sure to follow them carefully.
  • Tighten all bolts to the proper torque specifications: This will ensure that the exhaust system is properly sealed and that there are no leaks.

Conclusion

Choosing the right exhaust system for your 2011 Subaru WRX STI sedan is a significant upgrade that can enhance your car's performance, sound, and overall driving experience. By understanding the different types of exhaust systems available, considering the factors discussed above, and doing your research, you can make an informed decision and choose a system that meets your needs and preferences. Whether you're looking for maximum performance gains, an aggressive exhaust note, or a combination of both, there’s an exhaust system out there that’s perfect for your ride. So go ahead, guys, and give your 2011 WRX STI sedan the exhaust system it deserves!