Flowmaster 40 Series Delta Flow Mufflers
Flowmaster’s Delta Flow 40 Series two chamber design incorporates Flowmaster’s patented Delta Flow technology. The “Delta” deflectors generate increased scavenging for better performance and reduced interior sound. Perfect for vehicles where an aggressive exterior tone is desired with reduced interior tone.
Application Recomendations:
- The quietest 40 Series two-chamber muffler
- Reduced resonance over other 40 series mufflers
- Stainless steel 409S version backed by a lifetime warranty
- Features advanced two-chamber design & Delta Flow technology
- Available in aluminized steel or 409S Stainless for harsh weather
- Both styles are fully MIG-welded for maximum durability
| Description | Part No. | List Price |
Click For Details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 2.25" Outlet Diameter: 2.25" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
42441 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 2.25" Outlet Diameter: 2.25" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
42443 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 2" Outlet Diameter: 2" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
425404 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 2.50" Outlet Diameter: 2.50" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
42541 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 2.50" Outlet Diameter: 2.50" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
42543 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 3" Outlet Diameter: 2" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
430402 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 3" Outlet Diameter: 3" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
43041 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER Inlet Diameter: 3" Outlet Diameter: 3" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
43043 | $140.85 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 2.25" Outlet Diameter: 2.25" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
8042441 | $173.64 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 2.25" Outlet Diameter: 2.25" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
8042443 | $173.64 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 2.50" Outlet Diameter: 2.50" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
8042541 | $173.64 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 2.50" Outlet Diameter: 2.50" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
8042543 | $173.64 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 3" Outlet Diameter: 2" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
80430402 | $173.64 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 3" Outlet Diameter: 3" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
8043041 | $173.64 |  details |
| FLOWMASTER ORIGINAL 40 SERIES MUFFLER STAINLESS STEEL Inlet Diameter: 3" Outlet Diameter: 3" Diameter: 4" OAL: 19" Case Length: 13" Width: 9.75" Height: 5" Weight: 12 |
8043043 | $173.64 |  details |