Centre/Centre, Straight Through
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Centre/Centre, Straight Through

The Flowtech Performance series of mufflers are available in a full range of barrel lengths, barrel diameters and inlet/outlet sizes and configurations. The straight through designs help deliver:

  • Awe-inspiring sound
  • Enhanced performance
  • Improved fuel economy
  • Unrestricted flow.

Made in Australia for Australian conditions, Flowtech Performance mufflers feature:

  • High heat painted finish for added durability
  • Aluminised steel construction for improved rust resistance
  • Fully welded (not folded) seams for added longevity
  • Reinforced end plates for superior strength (for larger, heavier chrome stacks)
  • Domed end plates (on round barrel mufflers) to prevent moisture build up
  • Fibre glass packing for superior tone - no hollow sound
  • Laser-engraved model plates to ensure consistency of supply
  • 2 year manufacturer warranty.

The most popular variant in the Flowtech Performance range is the M1044-500S. For universal application (most trucks with a 10" x 44" muffler setup), but many of our customers have found them particularly successful on Kenworth, Western Star and Freightliners with Cat C15 or Cummins Signature series engines.

These are heavy duty mufflers for heavy duty trucks!

5” (127mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M524-225 2¼” (57mm) 24" (609mm)
M530-225 2¼” (57mm) 30" (762mm)
M524-250 2½” (63mm) 24" (609mm)
M530-250 2½” (63mm) 30" (762mm)
M540-250 2½” (63mm) 40" (1015mm)
M548-250 2½” (63mm) 48" (1220mm)
M524-300 3” (76mm) 24" (609mm)
M530-300 3” (76mm) 30" (762mm)
M540-300 3” (76mm) 40" (1015mm)
M548-300 3” (76mm) 48" (1220mm)

6” (152mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M614-250 2½” (63mm) 14" (356mm)
M616-250 2½” (63mm) 16" (406mm)
M618-250 2½” (63mm) 18" (457mm)
M620-250 2½” (63mm) 20" (508mm)
M614-300 3” (76mm) 14" (356mm)
M616-300 3” (76mm) 16" (406mm)
M618-300 3” (76mm) 18" (457mm)
M620-300 3” (76mm) 20" (508mm)
M624-300 3” (76mm) 24" (610mm)
M636-300 3” (76mm) 36" (914mm)
M614-350 3½” (89mm) 14" (356mm)
M616-350 3½” (89mm) 16" (406mm)
M618-350 3½” (89mm) 18" (457mm)
M640-350 3½” (89mm) 40" (1015mm)
M616-400 4” (102mm) 16" (406mm)
M618-400 4” (102mm) 18" (457mm)
M624-400 4” (102mm) 24" (610mm)
M630-400 4” (102mm) 30" (762mm)
M640-400 4” (102mm) 40" (1015mm)
M655-400 4” (102mm) 55" (1397mm)

7” (178mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M724-225 2¼” (57mm) 24" (609mm)
M716-250 2½” (63mm) 16" (406mm)
M720-250 2½” (63mm) 20" (508mm)
M716-300 3” (76mm) 16" (406mm)
M718-300 3” (76mm) 18" (457mm)
M720-300 3” (76mm) 20" (508mm)
M724-300 3” (76mm) 24" (610mm)
M716-350 3½” (89mm) 16" (406mm)
M724-350 3½” (89mm) 24" (610mm)
M716-400 4” (102mm) 16" (406mm)
M728-400 4” (102mm) 28" (711mm)
M740-400 4” (102mm) 40" (1015mm)
M744-500 5” (127mm) 44" (1120mm)
M744-500L 5” (127mm) 44" (1120mm)
M744-506 5” (127mm) In / 6” (152mm) Out 44" (1120mm)
M744-507 5” (127mm) In / 7” (178mm) Out 44" (1120mm)
M744-607 6” (152mm) In / 7” (178mm) Out 44" (1120mm)

8” (203mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M824-250 2½” (63mm) 24" (609mm)
M824-300 3” (76mm) 24" (610mm)
M832-300 3” (76mm) 32" (813mm)
M838-350 3½” (89mm) 38" (965mm)
M830-400 4” (102mm) 30" (762mm)
M836-400 4” (102mm) 36" (915mm)
M836-500 5” (127mm) 36" (915mm)
M844-500 5” (127mm) 44" (1120mm)
M844-506 5” (127mm) In / 6” (152mm) Out 44" (1120mm)
M844-507 5” (127mm) In / 7” (178mm) Out 44" (1120mm)

9” (230mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M944-350 3½” (89mm) 44" (1120mm)
M912-400 4” (102mm) 12" (305mm)
M920-400 4” (102mm) 20" (508mm)
M926-400 4” (102mm) 26" (660mm)
M944-400 4” (102mm) 44" (1120mm)
M912-500 5” (127mm) 12" (305mm)
M920-500 5” (127mm) 20" (508mm)
M930-500 5” (127mm) 30" (762mm)
M936-500 5” (127mm) 36" (915mm)
M944-500 5” (127mm) 44" (1120mm)
M944-506 5” (127mm) In / 6” (152mm) Out 44" (1120mm)
M944-507 5” (127mm) In / 7” (178mm) Out 44" (1120mm)

10” (254mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M1044-400 4” (102mm) 44" (1120mm)
M1050-438 4⅜” (110mm) 50" (1270mm)
M1044-450 4½” (114mm) 44" (1120mm)
M1050-450 4½” (114mm) 50" (1270mm)
M1044-500S 5” (127mm) 44" (1120mm)
M1044-500L 5” (127mm) 44" (1120mm)
M1050-500 5” (127mm) 50" (1270mm)
M1055-500 5” (127mm) 55" (1397mm)
M1044-506 5” (127mm) In / 6” (152mm) Out 44" (1120mm)
M1044-507 5” (127mm) In / 7” (178mm) Out 44" (1120mm)
M1044-508 5” (127mm) In / 8” (203mm) Out 44" (1120mm)

11” (280mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M1144-600 6” (152mm) 44" (1120mm)

12" (305mm) OD Barrel

Stock Code Inlet/Outlet Size (ID)Barrel Length
M1236-438 4⅜” (110mm) 36" (915mm)