Weapon R Header

2008–2015 Scion xB2

953-204-106

Overview:

The Weapon R 4-2-1 Stainless Steel Race Header is a high-performance exhaust component designed specifically for the 2008–2015 Scion xB2. Engineered to maximize exhaust flow at high RPMs, this long tube header enhances engine efficiency and power output, making it an ideal upgrade for serious racers and performance enthusiasts. Its stepped tubing design optimizes torque gains across the rev range, particularly benefiting vehicles equipped with high lift cams and engines tuned for high RPM operation.

Built for competition use, the Weapon R header replaces the factory exhaust manifold and catalytic converter, delivering unrestricted exhaust flow and improved throttle response. This header is perfect for those seeking to extract maximum performance from their Scion xB2 on the track or off-road environments.

Key Features:

The Weapon R header incorporates advanced design elements to ensure superior performance and durability:

• 4-2-1 long tube design for optimal high RPM exhaust scavenging
• Stepped tubing to enhance torque gains throughout the powerband
• Constructed from high-quality stainless steel for corrosion resistance and longevity
• 2.5-inch collector diameter to support high exhaust flow rates
• Eliminates the catalytic converter for maximum flow (off-road use only)
• Extensively tested and developed on Weapon R’s Dynapack dynamometer
• Designed specifically for the 2008–2015 Scion xB2 (xB2 chassis)
• Ideal for vehicles with high lift camshafts and high RPM tuning
• Includes a two-piece header system with integrated S-pipe for smooth exhaust transition

Construction & Design:

The Weapon R header is crafted from premium stainless steel, ensuring excellent resistance to heat and corrosion while maintaining structural integrity under extreme conditions. The long tube 4-2-1 configuration is engineered to optimize exhaust pulse timing, which improves cylinder scavenging and enhances torque delivery. The stepped tubing design further refines exhaust flow dynamics, providing a balance between low-end torque and high-end horsepower.

Each header is precision-welded and finished to exacting standards, reflecting Weapon R’s commitment to quality and performance. The inclusion of a 2.5-inch collector allows for increased exhaust volume, which is critical for high RPM power gains.

Performance & Sound

By eliminating the restrictive factory catalytic converter and utilizing a long tube design, this header significantly improves exhaust flow, resulting in enhanced throttle response and increased power at higher engine speeds. The Weapon R header produces a more aggressive exhaust note, characteristic of race-oriented setups, providing an exhilarating driving experience for enthusiasts.

Installation & Fitment:

This header is designed as a direct fit replacement for the 2008–2015 Scion xB2 models. Installation requires removal of the factory exhaust manifold and catalytic converter. Due to the elimination of emissions equipment, this product is intended for off-road or competition use only and is not legal for street use in states with emissions regulations.

For optimal operation and to prevent check engine light issues, the use of a Check Engine Light (CEL) eliminator is highly recommended.

What's Included:

• Weapon R 4-2-1 stainless steel race header
• Integrated S-pipe for exhaust flow management

Ideal For:

This header is ideal for Scion xB2 owners who participate in competitive racing or off-road events and are looking to maximize engine performance at high RPMs. It is particularly suited for vehicles with upgraded camshafts and aggressive tuning setups that demand improved exhaust flow and torque gains.

Emissions Note

This product eliminates the catalytic converter and is not compliant with emissions regulations. It is intended for off-road use only and is not legal for use on public highways in any state.

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.