Flowmaster Flow FX Chambered Muffler Instruction Manual

1. Introduction and Overview

This manual provides essential information for the installation, operation, and maintenance of your Flowmaster Flow FX Chambered Muffler, Model 71226. The Flow FX series is engineered to deliver a moderate performance tone, offering a deeper sound compared to traditional chambered mufflers, while minimizing excessive cabin drone. This muffler is designed for universal fitment, making it suitable for a wide range of modern trucks, muscle cars, and daily drivers seeking enhanced exhaust performance and sound.

2. Product Features

• Straight-Through Performance: The Flow FX series mufflers are designed to provide a moderate, deep performance tone without the harshness or excessive cabin drone often associated with other muffler types.
• Perforated Core Technology: Internally, the muffler features a large diameter straight-through stainless steel perforated core. This design, combined with high-temperature sound-absorbing materials, contributes to a traditional mellow tone.
• Proven Performance Enhancement: By optimizing exhaust flow and reducing back pressure, this muffler can contribute to improved horsepower and torque. It is an ideal choice for street enthusiasts and daily drivers looking for a performance upgrade.
• Durable Construction: Manufactured from robust 409S stainless steel, the muffler is fully MIG-welded. This construction ensures long-lasting performance, excellent corrosion resistance, and reduced vibration.
• Universal Fitment: The design allows for maximum versatility, featuring reversible flow paths. This adaptability enables installation in tight spaces and custom exhaust builds, accommodating various inlet/outlet configurations.

3. What's in the Box

Your Flowmaster Flow FX Chambered Muffler package includes the following:

• One (1) Flowmaster Flow FX Chambered Muffler (Model 71226)

4. Specifications

5. Setup and Installation

Installation of the Flowmaster Flow FX muffler requires specialized tools and knowledge of exhaust systems. It is highly recommended that installation be performed by a qualified professional to ensure proper fitment, sealing, and safety.

5.1. Safety Precautions

• Always work on a cool vehicle. Exhaust components can remain extremely hot for extended periods after operation.
• Use appropriate personal protective equipment (PPE), including safety glasses, gloves, and hearing protection.
• Ensure the vehicle is securely supported on jack stands or a lift before working underneath. Never rely solely on a jack.
• Disconnect the vehicle's battery before beginning work to prevent accidental electrical shorts.

5.2. General Installation Steps (Professional Installation Recommended)

1. Preparation: Park the vehicle on a level surface and allow the exhaust system to cool completely. Lift and secure the vehicle.
2. Remove Old Muffler: Carefully remove the existing muffler. This may involve cutting the exhaust pipe or unbolting flanges. Note the orientation and position of the original muffler.
3. Fitment Check: Test fit the Flowmaster Flow FX muffler to determine the best orientation and connection points. The muffler is reversible, offering flexibility.
4. Connection: Depending on your vehicle's exhaust system, the muffler can be welded into place or connected using exhaust clamps. Ensure all connections are secure and airtight to prevent exhaust leaks.
5. Hanger Installation: Reinstall or adapt existing exhaust hangers to securely support the new muffler. Ensure adequate clearance from vehicle components to prevent rattling or heat damage.
6. Final Inspection: Double-check all connections, clearances, and hanger security. Start the vehicle and check for exhaust leaks and proper sound.

For vehicle-specific installation instructions or complex custom setups, consult a professional exhaust technician.

Image 1: Side view of the Flowmaster Flow FX Chambered Muffler, showcasing its compact, oval design and inlet/outlet pipes.

Image 2: Top view of the Flowmaster Flow FX Chambered Muffler, highlighting the embossed Flow FX logo.

Image 3: Angled view of the Flowmaster Flow FX Chambered Muffler, showing the inlet and outlet pipes from a different perspective.

Image 4: Internal view of the Flowmaster Flow FX Chambered Muffler, illustrating the straight-through perforated core design responsible for its sound characteristics.

6. Operating Principles

The Flowmaster Flow FX muffler operates on a straight-through design principle. Exhaust gases flow directly through a perforated core, which is surrounded by sound-absorbing materials. This design allows for minimal restriction to exhaust flow, contributing to performance gains, while the sound-absorbing materials effectively dampen unwanted frequencies and produce a deep, moderate exhaust note. Unlike traditional chambered mufflers that use internal baffles to redirect sound waves, the Flow FX design focuses on absorption for a smoother, less aggressive tone with reduced interior resonance.

7. Maintenance

The Flowmaster Flow FX muffler is constructed from durable 409S stainless steel, designed for long-term performance with minimal maintenance. However, periodic inspection is recommended to ensure optimal function and longevity.

7.1. Inspection

• Visual Check: Regularly inspect the muffler and surrounding exhaust components for signs of physical damage, such as dents, cracks, or punctures.
• Corrosion: While stainless steel is corrosion-resistant, inspect for any signs of surface rust or pitting, especially in areas exposed to road salt or harsh chemicals.
• Leaks: Check all welds and connections for exhaust leaks. Signs of a leak include black soot around joints or a noticeable change in exhaust sound.
• Hangers and Mounts: Ensure all exhaust hangers and mounting points are secure and free from excessive wear or damage. Loose hangers can lead to rattling noises or premature component failure.

7.2. Cleaning

Under normal operating conditions, the muffler does not require specific cleaning. If desired, the exterior can be wiped down with a damp cloth to remove dirt and grime. Avoid using harsh abrasive cleaners that could damage the stainless steel finish.

8. Troubleshooting

If you experience issues with your Flowmaster Flow FX muffler, consider the following common troubleshooting steps:

8.1. Excessive Noise or Rattling

• Loose Hangers: Check if the muffler or exhaust pipes are loose in their hangers. Secure or replace worn hangers.
• Contact with Vehicle Components: Ensure the muffler or exhaust piping is not making contact with the vehicle's frame, body, or suspension components. Adjust positioning if necessary.
• Internal Damage: While rare, internal damage to the muffler's core can cause rattling. This typically requires muffler replacement.

8.2. Exhaust Leaks

• Loose Connections: Inspect all clamps and welded joints for signs of leaks (e.g., black soot, audible hissing). Tighten clamps or repair welds as needed.
• Cracks: Check the muffler casing and pipes for any cracks, especially near welds. Cracks will require professional repair or replacement.

8.3. Change in Exhaust Tone or Performance

• Exhaust Restriction: A significant change in tone or a decrease in performance could indicate a blockage or collapse within the exhaust system (e.g., catalytic converter, other mufflers).
• Engine Issues: Ensure the engine is running correctly. Misfires or other engine problems can affect exhaust sound.

If troubleshooting steps do not resolve the issue, it is recommended to consult a professional exhaust specialist or mechanic for diagnosis and repair.

9. Warranty and Support

For detailed information regarding the warranty coverage for your Flowmaster Flow FX Chambered Muffler, please refer to the official Flowmaster website or the warranty documentation included with your purchase. Warranty terms typically cover manufacturing defects and material flaws.

For technical support, installation assistance, or warranty claims, please contact Flowmaster customer service directly through their official channels. Ensure you have your product model number (71226) and proof of purchase available when contacting support.

Flowmaster Official Website: www.flowmastermufflers.com