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Flowmaster 13 Original 40 Series Muffler With 2-1/2 Offset Inlet / 2-1/2 Offset Outlet

F42543 - Flowmaster 13" Original 40 Series Muffler With 2-1/2" Offset Inlet / 2-1/2" Offset Outlet

This is the most "aggressive" sounding street/strip muffler that Flowmaster offers.

If you're looking for attention, this one will get you noticed. The original standard 40 series has an "aggressive rumble" and will generally resonate inside the vehicle around 1800-2000 rpm's, and again at 2400-2600 rpm's.

Constructed of 16 gauge aluminized steel and fully mig-welded for maximum durability.


  • 4" thick
  • 9-3/4" wide
  • 13" case lenght
  • 19" overall length

Product #: F42543

In Stock Now!

MSRP: $93.99 ea
Classic: $84.99 ea



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