Weapon R Header

2008–2014 Scion xD (xB2)

Part #: 953-116-109

Overview

The Weapon R 4-2-1 Race Header is a high-performance exhaust component engineered specifically for the 2008 to 2014 Scion xD (xB2). Designed to enhance engine efficiency and power output, this header delivers a significant increase in horsepower and torque with just the header upgrade alone. Ideal for enthusiasts who participate in weekend competition racing yet still use their vehicle for daily driving, the Weapon R header offers a perfect balance of performance and drivability.

Developed through extensive research and testing on Weapon R’s Dynapack dynamometer, this header is tailored to optimize exhaust flow and improve engine breathing. It is an excellent upgrade for drivers seeking to unlock additional power from their Scion xD without extensive modifications.

Key Features

The Weapon R header incorporates advanced design and quality construction to maximize performance gains. Key features include:

• 4-2-1 header design for improved exhaust scavenging and mid-range torque
• Precision-engineered to fit 2008–2014 Scion xD models
• Increases horsepower by 12.1 hp and torque by 9.8 lb-ft with just the header installed
• Constructed for durability and heat resistance under racing conditions
• Optimized for street and weekend competition use
• Tested and validated on Weapon R’s Dynapack dyno for reliable performance data
• Enhances throttle response and engine efficiency
• Designed to complement other performance upgrades

Construction & Design

The Weapon R header is crafted from high-quality materials engineered to withstand the rigors of racing and spirited driving. Its 4-2-1 tubular design improves exhaust gas flow by merging four primary tubes into two collectors before exiting through a single outlet, which enhances mid-range torque and overall power delivery. The header’s precise bends and smooth welds reduce turbulence and backpressure, contributing to more efficient engine breathing.

Each header is meticulously fabricated to ensure a perfect fitment on the Scion xD chassis, minimizing installation challenges and maintaining factory clearance. The robust construction also ensures long-lasting durability even under high-temperature conditions typical of race environments.

Performance & Sound

Installing the Weapon R header on your Scion xD results in a noticeable increase in horsepower and torque, specifically a gain of 12.1 hp and 9.8 lb-ft of torque. This power boost translates to improved acceleration and throttle response, making your vehicle more responsive during spirited driving or competitive events.

In addition to performance gains, the header produces a more aggressive exhaust note that enhances the driving experience without being overly loud for street use. This makes it an excellent choice for enthusiasts who want a sportier sound and feel without sacrificing daily drivability.

Installation & Fitment

The Weapon R header is designed for direct bolt-on installation on 2008–2014 Scion xD models, requiring no major modifications to the vehicle’s exhaust system. Installation typically involves removing the factory exhaust manifold and replacing it with the Weapon R header, using existing mounting points and hardware.

While installation is straightforward for those with mechanical experience, professional installation is recommended to ensure proper fitment and optimal performance. This header is intended for off-road and competition use only and is not legal for use on public highways.

What's Included

• Weapon R 4-2-1 Race Header for 2008–2014 Scion xD
• Mounting hardware and gaskets
• Installation instructions

Ideal For

This header is ideal for Scion xD owners who participate in weekend competition racing or track days and desire a reliable power upgrade without sacrificing daily drivability. It suits enthusiasts looking to improve mid-range torque and horsepower with a bolt-on solution that enhances both performance and exhaust sound.

Emissions Note

Important: This Weapon R header is intended for off-road use only and is not legal for use on public highways. It does not comply with 50-state emissions regulations and should be used exclusively in competition or off-road environments.

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.