Weapon R Header

2005–2010 Scion tC

Part #: 953-116-104

Overview

The Weapon R 4-2-1 Race Header is a high-performance exhaust component engineered specifically for the 2005–2010 Scion tC. Designed to maximize exhaust flow and improve engine output, this long tube header delivers significant horsepower and torque gains, making it an ideal upgrade for enthusiasts seeking enhanced performance on the track or in competitive racing environments. Its 4-2-1 design optimizes scavenging and mid-range torque, providing a balanced power increase across the RPM range.

Built for vehicles equipped with high lift cams and engines that operate in a high RPM rev band, the Weapon R header is tailored to extract maximum power at elevated engine speeds. This race-oriented header is perfect for drivers who demand aggressive performance improvements and are focused on competition use.

Key Features

This header incorporates advanced design elements to ensure superior exhaust flow and durability:

• 4-2-1 long tube design for optimized exhaust scavenging and improved mid-range torque
• Stepped tubing construction to enhance torque gains throughout the RPM range
• 2.5-inch collector diameter to support high exhaust flow and reduce backpressure
• Eliminates the catalytic converter for unrestricted exhaust flow (off-road use only)
• Extensively tested and developed on Weapon R’s Dynapack dynamometer for proven performance
• Designed specifically for high RPM and high lift camshaft applications
• Race-focused design not compliant with 50-state emissions regulations

Construction & Design

The Weapon R header is constructed with precision-engineered stepped tubing that balances exhaust velocity and flow volume to maximize torque and horsepower gains. Its long tube configuration improves exhaust scavenging efficiency, which is critical for high-performance engines operating at elevated RPMs. The 2.5-inch collector ensures that exhaust gases exit smoothly, minimizing restrictions and enhancing overall engine breathing.

Manufactured with durable materials and subjected to rigorous research and development, this header is built to withstand the demands of competitive racing. However, it is important to note that ceramic coating or any modifications to the header will void the warranty and may cause warping.

Performance & Sound

The Weapon R 4-2-1 Race Header delivers a measurable increase of 13.4 horsepower and 6.4 lb-ft of torque, translating into sharper throttle response and improved acceleration. Its design promotes a more aggressive exhaust note, characteristic of race headers, providing an exhilarating auditory experience that complements the enhanced performance.

Installation & Fitment

This header is designed as a direct fit for the 2005–2010 Scion tC, ensuring a straightforward installation process for experienced mechanics or performance shops. It requires removal of the factory exhaust manifold and catalytic converter, and due to its race-oriented design, it is recommended for off-road use only. Installation of a Check Engine Light (CEL) eliminator is highly recommended to prevent error codes related to the removed catalytic converter.

What's Included

• Weapon R 4-2-1 Race Header for 2005–2010 Scion tC
• Installation hardware
• Warranty documentation

Ideal For

This header is ideal for Scion tC owners who participate in competitive racing or track events and are looking to maximize engine output at high RPMs. It suits builds with high lift camshafts and those seeking a race-proven exhaust upgrade that prioritizes power and torque gains over emissions compliance.

Emissions Note

This product eliminates the catalytic converter and is not legal for use on public highways or in states with strict emissions regulations. It is intended for off-road and competition use only. Use of this header on public roads may result in legal penalties and vehicle inspection failures.

Weapon*R is a long-running import performance brand best known for intake systems and filtration products like their Secret Weapon and Dragon intake lines. Founded in the early ’90s with a focus on high-performance parts, Weapon*R products are aimed at enthusiasts who want improved airflow, aggressive induction sound, and bolt-on style upgrades for sport-compact platforms.