We will be closed for the Holidays: December 23rd - 26th.
Any orders placed during this time will be shipped on December 27th.
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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.

707.544.4761
BUSINESS HOURS
 

FLOWMASTER 50 SERIES BIG BLOCK MUFFLERS

Our largest and quietest muffler, the 50 Series Big Block Mufflers is made for tow vehicles, full-size trucks, large SUV’s and RV’s/Motor homes. More than just compatible with big cubic inch engine application, the 50 Series Big Block incorporates a very large Resonance Tuning Chamber to almost completely reduce interior sound in large cab vehicle and enough case volume to handle engines under heavy loads – perfect for tow vehicle. Significant improvements in mileage, torque, and horsepower are to be expected from this muffler, as well as decreased engine heat and wear.

  • The quietest Flowmaster we make!
  • Available in 16-gauge aluminized steel
  • Fully MIG-welded for maximum warranty
  • Greatly reduces interior sound and resonance

 

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50 Series Big Block Mufflers

IN/OUT C/C O/C C/O O/O O/O SAME SIDE
3.50" 53553
IN/OUT D/C C/D D/D O/D
2.75"/2.50" 527504
3.00"/2.50" 530504
3.00"/3.50" 530513