A raw test of 7 different Flowmaster mufflers on one motor.

Flowmaster 817745 Axle-back System(409S - DOR - Outlaw)


Flowmaster Exhaust: Mufflers, Systems, Tips & More

Even so, every set of Flowmaster short-tubes have the same features and construction as the long-tubes, including the velocity spike, 3/8-inch and laser cut flanges, and mandrel bent primary tubes. “We’ve seen some impressive gains from the short-tube headers,” says Thomas. “Especially when you consider that you can install them yourself in just a few hours and bolt them right up to your existing exhaust.”

The Flowmaster shorties dropped right into place in the Mustang’s tight engine compartment and easily cleared all of the factory brackets, suspension, and steering components with no problem. Unlike some other header installs, we didn’t have to modify the Flowmaster Scavenger Series shorites to make them fit.

Flowmaster Exhaust, Mufflers & Tips - #1 Best Price

  • Flowmaster® 8042543 - 40 Series Original Stainless Steel Muffler (Aggressive Sound, 2.5" Offset Inlet / 2.5" Offset Outlet)
  • Read reviews on Flowmaster Exhaust, Mufflers & Tips

    Flowmaster is also offering CARB certified 50-state legal short-tube headers like these Shorties for 5th Gen Camaros (). They have 1-3/4-inch primaries and 3-inch outlets that bolt directly to your stock exhaust system.

    The collector flanges mated right up to the Flowmaster American Thunder exhaust downpipes, and the included hardware and correct gaskets just made things go even smoother.