1. Product Overview
The Flowmaster Super 10 Series Muffler, Model 842515, is engineered for vehicles requiring an aggressive exhaust tone. This single-chambered muffler features a 2.50-inch center inlet and a 2.50-inch center outlet, designed to enhance exhaust velocity and reduce back pressure for improved horsepower, torque, and throttle response.
It is constructed from durable 409 stainless steel and is fully MIG-welded to withstand demanding automotive conditions. The compact design allows for versatile installation in various custom and modified exhaust setups.

Image 1: Flowmaster Super 10 Series Muffler, highlighting its part number and inlet/outlet dimensions.
2. What's in the Box
The package for the Flowmaster Super 10 Series Muffler (Model 842515) includes:
- One (1) Flowmaster 842515 Super 10 Muffler 409S - 2.50 Center IN / 2.50 Center OUT
3. Installation Guidelines
Professional installation is recommended for this product. Ensure the vehicle is safely secured on a lift or jack stands before beginning work. Always wear appropriate personal protective equipment, including safety glasses and gloves.
- Preparation: Allow the vehicle's exhaust system to cool completely. Identify the section of the existing exhaust system where the new muffler will be installed.
- Removal of Old Muffler: Carefully cut or unbolt the existing muffler from the exhaust system. Ensure all hangers and clamps are removed.
- Fitment Check: Position the Flowmaster Super 10 muffler in the desired location. Verify that the 2.50-inch center inlet and outlet align correctly with the existing or new exhaust piping. The muffler features reversible flow paths for maximum versatility.
- Securing the Muffler: Use appropriate exhaust clamps or weld the muffler into place. Ensure all connections are secure and leak-free.
- Final Inspection: After installation, start the vehicle and check for any exhaust leaks. Listen for proper sound and ensure there is adequate clearance from other vehicle components.

Image 2: An installed Flowmaster Super 10 Series Muffler, showcasing its compact size and universal fitment.
4. Operating Characteristics
The Flowmaster Super 10 Series Muffler is designed to produce an aggressive exterior sound level with moderate interior resonance. This is Flowmaster's loudest and most aggressive chambered muffler, ideal for enthusiasts seeking a pronounced exhaust note.

Image 3: Sound level comparison chart for Flowmaster mufflers, positioning the Super 10 Series as aggressive.
The patented Delta Flow Technology within the muffler increases exhaust velocity and reduces back pressure, contributing to enhanced engine performance.

Image 4: Internal view of a Flowmaster muffler, illustrating the Delta Flow Technology.
5. Maintenance
The Flowmaster Super 10 Series Muffler requires minimal maintenance. Regular inspection of the exhaust system is recommended to ensure optimal performance and longevity.
- Visual Inspection: Periodically check the muffler and surrounding exhaust components for any signs of damage, corrosion, loose connections, or leaks.
- Cleaning: Clean the exterior of the muffler as needed to remove dirt and road grime. Use mild soap and water, avoiding harsh chemicals that could damage the finish.
- Connection Integrity: Ensure all clamps and welds remain secure. Tighten any loose clamps or consult a professional for weld repairs if necessary.
6. Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Excessive Noise/Rattling | Loose connections, damaged hangers, internal muffler damage. | Inspect all connections and hangers. Tighten loose clamps. If internal damage is suspected, professional inspection is advised. |
| Exhaust Leak | Improperly sealed connections, cracked welds. | Check all joints and welds. Re-tighten clamps or seek professional welding repair. |
| Reduced Performance | Obstruction in exhaust path, incorrect installation. | Verify correct installation and ensure no blockages are present. Consult a professional if issues persist. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Flowmaster |
| Model Number | 842515 |
| Material | 409 Stainless Steel |
| Inlet/Outlet Configuration | 2.50" Center In / 2.50" Center Out |
| Item Dimensions (L x W x H) | 14.5 x 10 x 4.5 inches |
| Item Weight | 6.1 pounds |
| Sound Level | Aggressive |
| Fitment Type | Universal Fit |

Image 5: Dimensional diagram of the Flowmaster Super 10 Series Muffler.
8. Official Product Video
Video 1: Flowmaster Lifestyle Video. This video provides an overview of Flowmaster products and their manufacturing process.
9. Warranty and Support
This Flowmaster product comes with a 10 Year Limited Warranty from the manufacturer. For specific details regarding warranty coverage, claims, or technical support, please refer to the official Flowmaster website or contact their customer service directly.
For returns, please adhere to the retailer's return policy, which typically allows for refunds or replacements within 30 days of purchase.




