1970 Camaro with a 502 and Flowmaster Super HP-2 ExhaustYouTube Button

Flowmaster Super HP-2 Muffler 304SS

Super HP-2 Muffler 304SS - 2.50 Center In./2.50 Center Out - Moderate Sound

PART# 12518304

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$199.95   Suggested Retail
$161.96   Holleydays Price
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Universal Muffler - Not a direct fit. Some adaptation required.


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


Body Height (in)4
Body Length (in)18
Body Width (in)5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Emission Code5
Inlet Diameter (in)2.5
Inlet PositionCenter
MaterialStainless Steel
Muffler SeriesHP-2 Series
Outlet Diameter (in)2.5
Outlet PositionCenter
Product TypeStreet Mufflers
Sound LevelModerate Sound
Part Number12518304


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.

    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.

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