FLOWMASTER 40 SERIES ORIGINAL MUFFLERS

The muffler that started it all, the original 40 Series Muffler is an aggressive sounding street/strip muffler that delivers a powerful “Flowmaster Sound” you’ve heard so much about it. If you really want to hear your exhaust system and that great muscle car tone – from both inside and out of the vehicle – the 40 Series is for you.

The original high performance Flowmaster muffler
Aggressive sound for the enthusiast you likes their exhaust LOUD
Available in either aluminized steel or 409S Stainless
Stainless steel mufflers covered by limited lifetime warranty
Fully MIG welded for durability

FM_40_Series_Cutaway

40 Series Muffler Table


IN/OUT	C/C	O/C	C/O	O/O	O/O SAME SIDE
2.25"		42441	42442	42443
2.50"		42541	42542	42543
3.00"		43041		43043
409S Stainless Steel Models
2.25"		8042441		8042443
2.50"		8042541		8042543
3.00"		8043041		8043043


IN/OUT	D/C	C/D	D/D	O/D
2.25"/2.25"
2.50"/2.50"			425404
3.00"/2.50"		430402
409S Stainless Steel Models
3.00"/2.50"		80430402