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The Subaru WRX is a beloved performance car known for its rally heritage and impressive power. One of the most popular modifications among WRX enthusiasts is upgrading the exhaust system. In this article, we will compare the STi turbo back exhaust and various aftermarket options to determine which one adds the most power to your WRX.
Understanding Turbo Back Exhausts
A turbo back exhaust system replaces the entire exhaust setup from the turbocharger to the rear of the vehicle. This includes the downpipe, mid-pipe, and cat-back sections. The primary goal of upgrading to a turbo back exhaust is to improve exhaust flow, which can lead to increased horsepower and torque.
STi Turbo Back Exhaust
The STi turbo back exhaust is a factory option designed specifically for the WRX. It is engineered to optimize performance while maintaining a level of comfort and compliance with emissions regulations.
Features of the STi Exhaust
- High-quality stainless steel construction
- Optimized for performance and sound
- Designed to work seamlessly with the WRX’s turbo system
- Maintains factory emissions compliance
The STi exhaust provides a balanced performance increase while ensuring that the vehicle remains street-legal. It is a great option for those who want a reliable upgrade without sacrificing daily drivability.
Aftermarket Turbo Back Exhausts
Aftermarket turbo back exhausts come in many varieties, each offering different features and performance benefits. These exhaust systems are often designed for maximum flow and may prioritize sound and performance over emissions compliance.
Popular Aftermarket Options
- Invidia Q300
- Greddy Supreme SP
- HKS Legamax
- Nameless Performance
Each of these brands offers unique designs and sound profiles, making them popular choices among WRX enthusiasts looking for significant performance gains.
Performance Gains from Aftermarket Exhausts
Aftermarket turbo back exhausts can provide substantial performance increases, often exceeding those of the STi exhaust. Many users report gains of 15-25 horsepower or more, depending on the specific system and additional modifications.
Comparative Analysis: STi vs. Aftermarket
When comparing the STi turbo back exhaust to aftermarket options, several factors come into play. These include power gains, sound, build quality, and legality.
Power Gains
While the STi exhaust offers respectable gains, aftermarket systems often provide more significant increases in horsepower and torque. The exact numbers vary based on the specific exhaust and other modifications made to the vehicle.
Sound Quality
The sound produced by an exhaust system is a crucial factor for many enthusiasts. The STi exhaust is designed to provide a refined sound that is not overly aggressive. In contrast, aftermarket options can range from subtle to extremely loud, depending on the design.
Build Quality
Both STi and aftermarket exhausts are typically made from high-quality materials, but the level of craftsmanship can vary among aftermarket brands. It’s essential to choose a reputable manufacturer to ensure durability and performance.
Legality and Emissions Compliance
The STi exhaust is designed to meet emissions regulations, making it a safe choice for street use. Many aftermarket exhausts may not comply with local emissions laws, which can lead to legal issues and failed inspections.
Conclusion
In conclusion, both the STi turbo back exhaust and aftermarket options have their advantages and disadvantages. The STi exhaust is a solid choice for those seeking a balance of performance, sound, and legality. However, for those looking to maximize power gains and willing to sacrifice some comfort or compliance, aftermarket turbo back exhausts present an exciting alternative.
Ultimately, the best choice depends on your personal preferences, driving style, and how you plan to use your WRX. Whether you opt for the STi exhaust or an aftermarket system, upgrading your exhaust is a fantastic way to enhance your vehicle’s performance.