1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your MAPerformance FlowFX Muffler 409S (2 Pack). Please read these instructions thoroughly before proceeding with installation or use to ensure optimal performance and safety.
2. Safety Information
- Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves, during installation.
- Ensure the vehicle is securely supported on jack stands or a lift before working underneath.
- Allow the exhaust system to cool completely before handling to prevent burns.
- Exercise caution when cutting or welding exhaust components.
- Professional installation is recommended for best results and safety.
3. Package Contents
Verify that all components are present before beginning installation:
- 2x FlowFX 2.25" Exhaust Mufflers
- Installation hardware (if included with specific kit)
The FlowFX mufflers feature a durable fully welded 409S stainless steel case and a straight-through design.
Image 1: Two FlowFX mufflers, highlighting their stainless steel construction and branding.
Image 2: A single FlowFX muffler, providing a detailed view of its construction.
4. Setup and Installation
Installation of the FlowFX mufflers typically involves replacing existing mufflers in your vehicle's exhaust system. Due to the specialized nature of exhaust system modifications, professional installation is highly recommended.
General Installation Steps (Consult a professional for specific vehicle requirements):
- Preparation: Park the vehicle on a level surface and engage the parking brake. Allow the exhaust system to cool completely. Lift the vehicle safely using a hoist or jack stands.
- Removal of Old Mufflers: Locate the existing mufflers. Depending on your vehicle, this may involve cutting the exhaust pipes before and after the muffler, or unbolting flange connections. Carefully remove the old mufflers and any associated hangers.
- Fitment of New Mufflers: Position the FlowFX mufflers in the desired location. Ensure correct orientation (inlet to engine side, outlet to tailpipe side). The 2.25" offset inlet and 2.25" center outlet configuration should match your exhaust piping.
- Connection: Secure the new mufflers using clamps or by welding them into place. Ensure all connections are tight and leak-free.
- Hanger Installation: Reinstall or replace exhaust hangers as needed to support the new mufflers and prevent excessive movement or vibration.
- Final Inspection: Lower the vehicle and start the engine. Check for any exhaust leaks and ensure proper clearance from other vehicle components.
5. Operating Principles
The FlowFX muffler series is designed to deliver a moderate performance sound level. Its straight-through design minimizes exhaust flow restriction, contributing to a distinct exhaust tone. This design differs from traditional chambered mufflers, offering a unique sound profile.
Video 1: This video demonstrates the sound and internal design of a Flowmaster 40 Series muffler, providing insight into Flowmaster's sound characteristics.
Video 2: This video showcases the aggressive exterior sound level of a Flowmaster Super 40 Series Chambered Muffler, illustrating the performance sound experience.
6. Maintenance
FlowFX mufflers are constructed from durable 409S stainless steel, designed for longevity with minimal maintenance. Regular inspection of the exhaust system is recommended:
- Periodically check for any signs of rust, corrosion, or damage to the muffler body and welds.
- Inspect all exhaust connections and clamps for tightness. Tighten any loose connections to prevent leaks.
- Examine exhaust hangers for wear or damage and replace as necessary to maintain proper system support.
- Clean the exterior of the mufflers with mild soap and water if desired, avoiding harsh chemicals that could damage the finish.
7. Troubleshooting
Common Issues and Solutions:
- Excessive Noise/Rattling:
- Check for loose connections or clamps.
- Inspect exhaust hangers for damage or improper installation.
- Ensure the muffler or exhaust pipes are not contacting other vehicle components.
- Exhaust Leaks:
- Visually inspect all welds and connections for cracks or gaps.
- Tighten clamps or re-weld as necessary.
- Muffler Damage:
- Physical damage from road debris or impacts may require replacement.
If issues persist, consult a qualified automotive technician.
8. Specifications
| Brand | MAPerformance |
| Model | Universal (FlowFX 409S) |
| Item Weight | 11.25 pounds |
| Product Dimensions | 21 x 10 x 4.5 inches |
| Manufacturer Part Number | 71225-2 |
| UPC | 675505442954 |
| Material | 409S Stainless Steel |
| Inlet/Outlet Configuration | 2.25" Offset In / 2.25" Center Out |
9. Warranty Information
For specific warranty details regarding your MAPerformance FlowFX Muffler 409S, please refer to the warranty documentation provided with your purchase or contact MAPerformance directly. Warranty coverage typically addresses manufacturing defects and material flaws under normal use conditions.
10. Support
If you have any questions, require technical assistance, or need further support regarding your FlowFX mufflers, please contact the manufacturer or your authorized dealer. Ensure you have your product model number and purchase information available when seeking support.
