Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Walker Quiet-Flow SS 21355 Direct Fit Exhaust Muffler. Please read these instructions thoroughly before beginning any work to ensure safety and optimal performance.
Image 1: The Walker Quiet-Flow SS 21355 Direct Fit Exhaust Muffler, a stainless steel component designed for vehicle exhaust systems.
Product Overview
The Walker Quiet-Flow SS 21355 muffler is engineered for durability and performance. Key features include:
- 100% Stainless Steel Construction: Designed for extended life compared to aluminized mufflers, with an internal drainage system to minimize moisture collection.
- Premium Acoustic Control: OE-style louvered tubes reduce noise levels, and domed heads help minimize radiated noise for a factory-style sound quality.
- Built to Last: Features internal partitions, mechanically joined tubes for thermal expansion/contraction, spun-locked heads, and OE-style spot welds for structural stability and longer service life.
Image 2: Illustration highlighting the 100% stainless steel construction of the muffler, indicating enhanced durability.
Image 3: Cutaway view of the muffler, showing the internal louvered tubes responsible for premium acoustic control and noise reduction.
Image 4: Close-up of the muffler's end, illustrating the spun-locked heads and OE-style spot welds that contribute to its robust construction.
Compatibility
The Walker Quiet-Flow SS 21355 muffler is designed for direct fitment on specific vehicle models. It is compatible with:
- 1999-2002 Ford Expedition
- 1999-2002 Lincoln Navigator
Important: Before purchasing and installing, verify compatibility by entering your vehicle's year, make, model, engine, and trim information. Refer to any specific qualifier notes to ensure correct fitment.
Safety Information
Always prioritize safety when working on your vehicle's exhaust system.
- Wear appropriate personal protective equipment, including safety glasses and gloves.
- Ensure the vehicle is securely supported on jack stands or a lift before working underneath. Never rely solely on a jack.
- Allow the exhaust system to cool completely before handling to prevent burns.
- Work in a well-ventilated area to avoid exposure to exhaust fumes.
- If you are unsure about any step of the installation process, consult a qualified mechanic.
Installation Guide
The Walker Quiet-Flow SS 21355 muffler is designed as a direct-fit bolt-on replacement. This typically means it utilizes OE-style hangers, brackets, and pipe routings, simplifying installation without requiring specialized fabrication or welding.
Pre-Installation Steps:
- Gather Tools: Ensure you have the necessary tools, which may include wrenches, sockets, a penetrating lubricant, and a cutting tool if the old muffler needs to be cut.
- Lift Vehicle Safely: Raise the vehicle using a lift or jack stands on a level, stable surface.
- Inspect Existing System: Examine the current exhaust system for any other damaged components that may need replacement.
Muffler Replacement Steps:
- Remove Old Muffler: Loosen clamps and bolts connecting the old muffler. If necessary, use a cutting tool to remove the old muffler. Be careful of sharp edges and falling components.
- Clean Connection Points: Clean any rust or debris from the exhaust pipes where the new muffler will connect.
- Position New Muffler: Carefully position the Walker 21355 muffler, aligning its inlet and outlet with the existing exhaust pipes. Ensure hangers align with vehicle mounting points.
- Secure Connections: Use new clamps and bolts (or existing ones if in good condition) to secure the muffler to the exhaust pipes. Tighten all connections to prevent leaks.
- Check Hangers: Ensure all OE-style hangers are properly seated in their rubber isolators.
- Final Inspection: Double-check all connections for tightness and ensure the muffler has adequate clearance from other vehicle components.
- Lower Vehicle: Safely lower the vehicle.
- Test: Start the engine and listen for any exhaust leaks or unusual noises.
Image 5: The Walker muffler featuring a direct-fit design with an integrated flange, simplifying the installation process.
Image 6: A hand in a blue glove installing an exhaust component under a vehicle, demonstrating a typical installation step.
Image 7: A selection of exhaust clamps, illustrating the types of fasteners used to secure exhaust system components.
Image 8: Two mechanics working together under a vehicle, emphasizing that professional assistance may be beneficial for exhaust system work.
Operation
Once installed, the Walker Quiet-Flow SS 21355 muffler functions as a critical component of your vehicle's exhaust system. It is designed to reduce engine noise to OE-style levels and direct exhaust gases away from the vehicle. The internal design ensures efficient flow while maintaining a premium, factory-like sound quality.
Maintenance
Regular inspection of your exhaust system, including the muffler, can help identify potential issues early.
- Visual Inspection: Periodically check the muffler and surrounding exhaust pipes for signs of rust, cracks, holes, or loose connections.
- Hanger Integrity: Ensure all exhaust hangers are intact and securely holding the system in place.
- Noise Check: Listen for any changes in exhaust sound, which could indicate a leak or internal damage.
- Cleaning: While not typically required, you can gently clean the exterior of the muffler if excessive dirt or road grime accumulates.
Image 9: An example of a rusted muffler under a vehicle, illustrating the type of wear that regular inspections can help detect and prevent.
Troubleshooting
If you experience issues with your exhaust system after installing the Walker 21355 muffler, consider the following:
- Loud Noise/Rattling: Check all connections for tightness. Ensure hangers are properly seated and not allowing the muffler to contact other vehicle components. Inspect for any new cracks or holes.
- Exhaust Leaks: Listen for hissing sounds, especially when the engine is cold. Visually inspect all joints and welds. A smoke test can help pinpoint small leaks.
- Vibrations: Ensure the muffler is securely mounted and not touching the vehicle's frame or body. Check for damaged or worn rubber isolators on hangers.
If troubleshooting steps do not resolve the issue, it is recommended to consult a professional automotive technician.
Specifications
| Feature | Detail |
|---|---|
| Brand | Walker |
| Model Number | 21355 |
| Construction Material | 100% Stainless Steel |
| Inlet Diameter | 2.5 inches (ID) |
| Outlet Diameter | 2.5 inches (ID) |
| Item Dimensions (L x W x H) | 31 x 12.5 x 11.5 inches |
| Item Weight | 17.5 pounds |
| Vehicle Service Type | Car |
| UPC | 086387213554 |
Warranty and Support
The Walker Quiet-Flow SS 21355 muffler comes with a limited lifetime warranty, reflecting the manufacturer's confidence in its durability and performance. Additionally, it includes an exclusive 90-Day Safe and Sound Guarantee.
For detailed information regarding warranty terms, conditions, and to access support resources, please visit the official Walker Exhaust website: Walkerexhaust.com.
