Flowmaster 40 Series Delta Force Muffler - FLO843541940 SERIES DELTA STAINLESS 3. 50 3 1 2" Offset Inlet Center Outlet Part Number: FLO8435419 The Delta Force 40 series race mufflers utilize Flowmaster's Delta Flow technology and feature excellent power characteristics with good sound reduction qualities. Recommended for all racing applications where mufflers are required with a substantial decibel reduction over open headers. Features: Race proven Delta Flow technology No internal packing to blowout