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Flowmaster Super HP-2 Muffler 409SS

Super HP-2 Muffler 409SS - 2.00 Center In. / 2.00 Center Out - Aggressive Sound

PART# 12012409

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Flowmaster has taken the laminar core of our classic HP-2 muffler and wrapped it in a new compact square case. The new Super HP-2 Series muffler offers the same great performance benefits and moderate tone that you would expect from our laminar flow mufflers, now in a new sleek styling. These mufflers are available in either a 409S stainless steel case or a polishable 304S stainless steel case and in sizes ranging from 2.00 in., 2.25 in. and 2.50 in.. These mufflers are covered by Flowmaster's Lifetime Limited Warranty.


  • Stainless Steel Construction
  • Dyno Tuned For Maximum Performance
  • Lifetime Limited Warranty
  • Laminar Flow Technology


Automotive Item GradeHigh Performance
Body Height (in)4
Body Length (in)12
Body Width (in)5
Emission Code5
Inlet Connection TypePipe Connection
Inlet Diameter (in)2
Inlet PositionCenter
Material409 Stainless Steel
Muffler SeriesHP-2 Series
Muffler TypeLaminar Flow
Outlet Connection TypePipe Connection
Outlet Diameter (in)2
Outlet PositionCenter
Overall Length (in)18
Product TypeStreet Mufflers
Sound LevelAggressive Sound
Type of MufflerLaminar Flow
Vehicle Type4/6 CYL Engine
Classic Muscle Car
Late Model Muscle Car
Street Rod
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number12012409



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Universal Muffler - Not a direct fit. Some adaptation required.
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