Flowmaster 842518 | Exhaust Muffler

Part Number
Super 10 Series Muffler; 2.5 in. Offset Inlet/Offset Outlet; Case Dimension 4 in. x 9.5 in. x 6.5 in.; 409 Stainless Steel

Fits: 67-81 Chevrolet Camaro, 68-79 Pontiac Firebird, 11-14 Ford Mustang

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Super 10 Series 409S stainless steel - single chamber mufflers. Intended for customers who desire the loudest and most aggressive sound they can find. Because these mufflers are so aggressive, they are recommended only for off highway use and not for street driven vehicles. These mufflers utilize the same patented Delta Flow technology that is found in Flowmaster's other Super series mufflers to deliver maximum performance. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.

BRAND: Flowmaster


  • Exhaust Muffler
  • Super 10 Series™ Muffler
  • Limited Lifetime Warranty
  • Loudest Most Aggressive Sound
  • Premium Flowmaster Quality
  • Chambered; Exhaust; Performance muffler; muffler; flowmaster; race muffler; universal muffler; magnaflow; borla; gibson; stainless exhaust; stainless muffler; tuned muffler; sport muffler; tuner; tuned exhaust; exhaust upgrade; performance upgrade
  • Durable Fully Welded 16ga Stainless Steel
  • Patented Data Flow Technology
  • Holley Performance Emission Code 5: 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
  • Universal Race Muffler is not a direct fit. Some adaptation required.
  • Super 10 Series™ Muffler; 2.5 in. Offset Inlet/Offset Outlet; Case Dimension 4 in. x 9.5 in. x 6.5 in.; 409S Stainless Steel;
  • Recommended For Off Highway Use
  • Super 50 Sound Level
  • Muffler Super 10 409S 2.5in O/C


Automotive Item GradeHigh Performance
Body Height4.000 in.
Body Length6.500 in.
Body Width9.500 in.
California Proposition 65 Chemical Name 1Nickel (metallic)
California Proposition 65 Chemical Name 2Chromium (hexavalent compounds)
Inlet Connection TypePipe
Inlet Diameter2.500 in.
Inlet Inside Diameter2.500 in.
Inlet Outside Diameter2.500 in.
Inlet PositionOffset
Inlet TypeSingle Offset
Main Piping Diameter2.500 in.
MaterialStainless Steel
Mount TypeUses New Hangers (Not Included)
Muffler SeriesSuper 10 Series
Muffler TypeReflection
Outlet Connection TypePipe
Outlet Diameter2.500 in.
Outlet Outside Diameter2.500 in.
Outlet PositionOffset
Outlet TypeSingle Offset Outlet
Overall Length12.500 in.
Sound LevelAggressive
Tip Quantity0
TitleFlowmaster 842518 Super 10 Muffler 409S - 2.50 Offset In / 2.50 Offset Out - Aggressive Sound
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

2.5 in. Offset Inlet/Offset Outlet; Case Dimension 4 in. x 9.5 in. x 6.5 in.; 409S Stainless SteelNot Direct Fit-Some Adaptation Required



  • 1967-1981 Chevrolet Camaro
  • 2011-2014 Ford Mustang
  • 1968-1979 Pontiac Firebird
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