We will be closed for the Holidays: December 23rd - 26th.
Any orders placed during this time will be shipped on December 27th.
  Loading. Please wait.
FREE 3-Day SHIPPINGdetails...

Shipping is free via UPS Ground or 3-Day Select for orders of $25 or more (excludes transmissions). If the transit time using UPS Ground Shipping will exceed 3 days to your location, we will upgrade the shipping service to UPS 3-Day Select, at no cost to you.

Free shipping is available within the continental U.S. only. Shipping charges will apply to all other destinations.

BUSINESS HOURS
 

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

Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.

HELLO