Weapon R Street Header

2004–2006 Scion xA / xB

Part #: 953-116-102

Overview

The Weapon R Street Header is a high-performance 4-2-1 exhaust header engineered specifically for the 2004 to 2006 Scion xA and xB models. Designed to enhance both horsepower and torque, this header is an excellent upgrade for enthusiasts seeking improved engine efficiency and power delivery without sacrificing daily drivability. Ideal for weekend competition racers and spirited street drivers alike, the Weapon R Street Header delivers noticeable gains while maintaining a street-friendly design.

Developed through extensive research and testing on Weapon R’s Dynapack Dyno, this header provides a proven power increase of 11.1 horsepower and 10.8 lb-ft of torque with just the header installed. It is a perfect bolt-on solution for those looking to extract more performance from their Scion’s stock engine setup.

Key Features

The Weapon R Street Header combines advanced engineering with quality materials to optimize exhaust flow and engine output. Key features include:

• 4-2-1 header design for improved exhaust scavenging and mid-range torque
• Precision mandrel-bent tubing to maximize flow and reduce restrictions
• High-quality stainless steel construction for durability and corrosion resistance
• Direct bolt-on fitment for 2004–2006 Scion xA and xB models
• Dyno-proven horsepower and torque gains without additional modifications
• Street-oriented design suitable for daily driving and weekend racing
• Engineered to optimize exhaust pulse tuning for enhanced throttle response
• Includes all necessary gaskets and hardware for installation

Construction & Design

Crafted from premium stainless steel, the Weapon R Street Header is built to withstand the rigors of both street and track use. The mandrel-bent tubing ensures smooth bends that maintain consistent diameter throughout, minimizing turbulence and backpressure. This design promotes efficient exhaust gas evacuation, which translates directly into improved engine breathing and power output.

The 4-2-1 configuration is specifically tuned to enhance mid-range torque, making it ideal for daily driving scenarios as well as spirited acceleration. The header flanges are precision-machined to ensure a perfect seal and easy installation, reducing the risk of exhaust leaks and improving overall reliability.

Performance & Sound

With the Weapon R Street Header installed, drivers can expect a measurable increase in horsepower and torque, specifically an 11.1 hp and 10.8 lb-ft torque gain as tested on the dyno. This power boost enhances acceleration and throttle response, providing a more engaging driving experience.

The header also contributes to a more aggressive exhaust note, delivering a deeper and sportier sound without being overly loud or intrusive for daily driving. This balance makes it an excellent choice for enthusiasts who want performance gains along with an enhanced auditory presence.

Installation & Fitment

The Weapon R Street Header is designed for direct bolt-on installation on 2004–2006 Scion xA and xB models. Installation typically requires standard hand tools and can be completed by experienced DIYers or professional mechanics. No major modifications to the vehicle’s exhaust system are necessary, making it a straightforward upgrade.

It is recommended to inspect and replace any worn gaskets or hardware during installation to ensure a proper seal and optimal performance. Due to the header’s design and fitment, clearance and compatibility with other aftermarket components should be verified prior to installation.

What's Included

• Weapon R 4-2-1 Street Header
• Gaskets for header flange
• Mounting hardware
• Installation instructions

Ideal For

This header is ideal for Scion xA and xB owners who want to increase engine performance for weekend competition or spirited street driving while maintaining daily usability. It suits enthusiasts looking for a reliable, well-engineered exhaust upgrade that delivers measurable power gains and an enhanced exhaust tone.

Emissions Note

Important: This product 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 installed with consideration of local laws and regulations.