( Brand: Grimmspeed ), ( Mounting Style: Bolt-on ), ( Type: Header ), ( Manufacturer Part Number: GRM113026 ), ( Material: Stainless Steel ), ( Features: Unequal Length ), ( Universal Fitment: No ), ( Placement On Vehicle: Front ), ( Performance Part: Yes ), ( Country Of Origin: United States )
Review GRIMMSPEED Unequal Length Header Subaru Sti. Installed Only Days fits WRX STI 2004–2021
The Grimmspeed GRM113026 Unequal Length Header for Subaru WRX and STI models from 2004 to 2021 is a high-performance exhaust component designed to deliver enhanced power and torque gains, while also providing a distinctive and aggressive sound. This header is a crucial upgrade for those seeking to maximize the potential of their Subaru's engine.
The Grimmspeed Unequal Length Header is a 4-1 design, meaning it collects four cylinders into one pipe before the collector. This design provides better scavenging, which allows for a more efficient exhaust gas flow and improved engine breathing. The unequal length design ensures optimal gas flow for each cylinder, reducing backpressure and increasing power output.
This header is constructed from high-quality stainless steel, ensuring durability and resistance to corrosion. The header features a polished finish, adding a touch of sophistication to the underhood appearance. The Grimmspeed logo is proudly displayed on the header, a testament to its authenticity and quality.
The Grimmspeed GRM113026 Unequal Length Header is designed to be a direct-fit replacement for the OEM header on Subaru WRX and STI models. It comes with all necessary hardware for installation, making it a straightforward process for most DIY enthusiasts. However, it is recommended that the installation be performed by a professional to ensure proper fitment and optimal performance.
In summary, the Grimmspeed GRM113026 Unequal Length Header is a must-have upgrade for Subaru WRX and STI owners seeking to unlock more power and torque from their engines. With its high-quality construction, distinctive sound, and improved performance, this header is an essential addition to any Subaru enthusiast's exhaust system.
Grimmspeed GRM113026 Unequal Header for 04-21 Subaru WRX STI: A Detailed Analysis
The Grimmspeed GRM113026 unequal length header is a popular aftermarket performance part for the Subaru WRX STI model years 2004 to 2021. This header system is designed to optimize exhaust flow, enhance power output, and improve the overall driving experience. In this analysis, we will discuss the key features, pros, cons, and provide an ending conclusion with a recommendation.
Features:1. Unequal length design for optimal exhaust scavenging and flow.
2. High-quality 304 stainless steel construction for durability.
3. Designed to work with factory catalytic converters and OEM exhaust.
4. Compatible with various aftermarket exhaust systems.
5. Improves engine performance and responsiveness.
Pros:1. Enhanced power output: The unequal length design of the header system allows for optimal exhaust scavenging and flow, resulting in increased horsepower and torque.
2. Improved engine response: The header system improves engine response by reducing exhaust backpressure, allowing the engine to breathe more efficiently.
3. Durability: The high-quality 304 stainless steel construction ensures the header will last for years to come.
4. Versatility: The header system can be used with various aftermarket exhaust systems, making it a flexible choice for those who may upgrade their exhaust in the future.
5. Easy installation: The header system is designed to bolt on and requires minimal modifications for installation.
Cons:1. Cost: The Grimmspeed GRM113026 unequal length header is a premium aftermarket part, and its price may not be accessible for all Subaru WRX STI owners.
2. Noise: As with any aftermarket header system, there may be an increase in exhaust noise. This may not be desirable for those who prefer a quieter driving experience.
3. CEL: Some users have reported the check engine light (CEL) coming on after installing the header system. This issue can be resolved by using a wideband oxygen sensor or adjusting the fuel map.
Conclusion:The Grimmspeed GRM113026 unequal length header is an excellent performance upgrade for Subaru WRX STI owners who are looking to enhance their engine's power output and improve responsiveness. Despite its cost and potential noise increase, the benefits of the header system outweigh the drawbacks for those who prioritize performance.
Recommendation:If you're a Subaru WRX STI owner who is serious about performance and is willing to invest in a high-quality aftermarket header system, the Grimmspeed GRM113026 unequal length header is an excellent choice. However, if you're on a budget or prioritize a quieter driving experience, it may be worth considering alternative performance upgrades.
specifications maniheader:
- for models: Wrx, Sti
- for makes: Subaru
- for years: 2004-2021
- brand: Grimmspeed
- mounting style: Bolt-on
- type: Header
- manufacturer part number: GRM113026
- material: Stainless Steel
- features: Unequal Length
- universal fitment: No
- placement on vehicle: Front
- performance part: Yes
- country of origin: United States
seller maniheader:
- rating: 95.7%
- # reviews: 118
shipping maniheader:
- service: Flat Rate Freight
- class: Freight
- cost: $35.00
- type: Fixed
general maniheader:
- Car Truck Parts Accessories > Exhaust Emission Systems > Manifolds Headers
- condition: Used
offer maniheader:
- started: February 12, 2026
- sold: 0
- options: Ship-to-home
- availability: In Stock
- best offers: True
- quantity: 1
payments maniheader:
- wallet: Paypal
- credit card: Diners-club
- other
returns maniheader:
- policy: No Returns
Grimmspeed GRM113026 Is Similar To:
- Grimmspeed Grm001001 Hiflow Exhaust Crosspipe Subaru 02-05 Wrx 08-14 02-21 Sti Impreza (43.2% similar) $149.99–$189.99. (March 23rd, 2025)
- Grimmspeed 113008 Headers 2015-2021 Subaru Wrx (55.9% similar) $770.00–$974.00. (July 24th, 2025)
