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Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)
Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543) Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

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Product details

Management number 211951112 Release Date 2026/04/06 List Price US$36.00 Model Number 211951112
Category
  1. Automotive
  2. Performance Parts & Accessories
  3. Exhaust Systems & Parts
  4. Mufflers
  • LEGENDARY SOUND: This is the original Flowmaster muffler that enthusiasts know and love! Famous for its bold, aggressive bark and signature tone. It delivers the unmistakable attitude and street presence that made Flowmaster a legend.
  • TWO-CHAMBERED INTERNAL DESIGN: Flowmaster’s classic two-chambered layout delivers that bold, aggressive exhaust sound Flowmaster is known for. Perfect for muscle cars, street rods, trucks, off-road rigs, and custom builds.
  • PROVEN PERFORMANCE: Enhances airflow and reduces back pressure to help boost horsepower, torque, and throttle response.
  • BUILT TO LAST: Made from 16-gauge aluminized steel and fully MIG-welded to withstand high heat and vibration with no internal packing to blow out or wear down.
  • UNIVERSAL FITMENT: Designed for custom and modified exhaust systems, with multiple inlet/outlet sizes and configurations (center/offset, dual) for simplified installation and optimal fit.

UPC 700042029433 771395696528 700042010356
Shape Oval
Brand Name Flowmaster
Unit Count 1.0 Count
Item Weight 10 Pounds
Manufacturer Flowmaster
Model Number 42543
Configuration Offset/Offset
Material Type Alloy Steel
Item Type Name Flowmaster 42543 40 Series Muffler - 2.50 Offset IN / 2.50 Offset OUT - Aggressive Sound
Item Dimensions 19.8 x 10.2 x 4.5 inches
Automotive Fit Type Universal Fit
Included Components Flowmaster 42543 40 Series Muffler - 2.50 Offset IN / 2.50 Offset OUT - Aggressive Sound
Part Interchange Info 42543
Manufacturer Part Number 42543
OEM Equivalent Part Number 42543
Compatible with Vehicle Type Car
Manufacturer Warranty Description Check with the manufacturer
Global Trade Identification Number 00700042010356, 00700042029433

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

Flowmaster 40 Series Original Chambered Muffler – 2.50” Offset In / 2.50” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (42543)

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