fits model: Wrx. year: 2000–2004.

( Brand: Manley ), ( Manufacturer Part Number: 11171-8 ), ( Part Type: Valve Exhaust ), ( Warranty: 30 Days ), ( UPC: 807298040295 )
The Manley 11171-8 Race Exhaust Valves are a high-performance upgrade for your Subaru WRX (03 EJ20, 04 model) exhaust system. These valves are specifically designed to enhance your engine's performance and efficiency, making them an excellent choice for enthusiasts seeking to improve their vehicle's power output and overall driving experience.
Each Manley 11171-8 Race Exhaust Valve features a 1mm thickness, which is significantly thicker than OEM exhaust valves. This increased thickness provides superior strength and durability, reducing the risk of valve failure due to the high temperatures and pressures encountered in high-performance applications. Furthermore, the 1mm thick valves are designed to last longer, reducing the need for frequent replacements.
The valves also boast a 33mm intake and 6mm stem diameter, providing a larger valve area for improved airflow. This increased airflow allows more fuel and air to enter the combustion chamber, resulting in more complete combustion and a more powerful engine. The 6mm stem diameter is compatible with most aftermarket headers, making these valves a versatile upgrade option.
Manley Race Exhaust Valves are made from high-quality steel and are precision-machined to ensure a perfect fit. They also feature a durable, corrosion-resistant coating to protect against the harsh conditions of engine use.
Installing these Manley Race Exhaust Valves is a straightforward process that can be completed by any do-it-yourself enthusiast with basic mechanical skills. The included installation instructions and hardware make the process easy to follow, ensuring a successful installation.
In summary, the Manley 11171-8 Race Exhaust Valves are a high-quality, high-performance upgrade for Subaru WRX (03 EJ20, 04 model) exhaust systems. Their increased thickness, larger valve area, and durable construction provide improved engine performance, durability, and reliability. With their easy installation and compatibility with aftermarket headers, these valves are a great choice for any Subaru WRX owner seeking to enhance their car's power and driving experience.
Pros of buying Manley 11171-8 Race Exhaust Valves for WRX 03 EJ20 04:1. High-quality materials: Manley valves are made from high-grade steel and hardened for longevity and durability.
2. Improved performance: The race valves can help improve engine performance by reducing heat build-up and improving exhaust flow.
3. Enhanced sound: The race valves can also provide a more aggressive exhaust note, which some enthusiasts may find appealing.
Cons of buying Manley 11171-8 Race Exhaust Valves for WRX 03 EJ20 04:1. Cost: Manley valves are more expensive than stock valves, which may be a deterrent for some buyers.
2. Installation difficulty: Installing aftermarket valves can be a challenging task, especially for those without experience in engine work.
3. Potential for noise complaints: The louder exhaust note may be annoying to others, especially if the vehicle is driven frequently in residential areas.
Conclusion:If you're looking for high-performance exhaust valves for your WRX 03 EJ20 04, Manley 11171-8 Race Exhaust Valves are a solid option. However, it's important to consider the cost and installation difficulty before making a purchase. If you have the budget and the skills to install the valves yourself, they can provide significant performance and sound benefits. If not, you may want to consider other options that are easier to install and more budget-friendly.
Recommendation:If you're confident in your ability to install the valves yourself and have the budget to afford them, Manley 11171-8 Race Exhaust Valves are a great choice for improving engine performance and sound on your WRX 03 EJ20 04. However, if you're unsure about your installation abilities or don't want to spend the extra money, you may want to consider other options that are more budget-friendly and easier to install.
For kits, photo might show entire kit and listing is only for one component. Manley Race Exhaust Valves 1mm 33mm 6mm stem WRX 00-03 EJ20 04 STI EJ25 11171-8,:: Subaru EJ205/Sit EJ257 Master Set of 8. Note: Photos do not always represent the actual product.