The Flowmaster 42542 40 Series muffler delivers the aggressive exhaust tone associated with the original Flowmaster sound. Designed for drivers who want a strong exterior presence and a noticeable interior tone, this universal muffler is well-suited for street, strip, and off-road applications. Its 2.50-inch inlet and outlet support compatibility with exhaust systems using the same pipe size, while some adaptation may be required for installation depending on the vehicle and exhaust configuration.

Constructed from durable 16-gauge aluminized steel, the Flowmaster 42542 is fully MIG welded to help withstand demanding driving conditions and long-term exhaust system use. The robust steel construction provides resistance to heat and corrosion, making it a practical choice for performance-oriented builds and custom exhaust projects. Its universal design allows it to be incorporated into a wide range of applications where an aggressive sound and dependable muffler construction are desired.

The 40 Series uses Flowmaster's chambered muffler design without internal packing that can burn out or blow away over time. This helps maintain a consistent exhaust character and reduces concerns associated with repackable or packed mufflers. Whether used on a street-driven vehicle, a street-and-strip setup, or an off-road project, the Flowmaster 42542 combines recognizable sound, durable construction, and flexible installation potential. Professional installation is recommended to ensure proper alignment, secure welding or connection, and adequate exhaust clearance.

• Excellent choice for street, strip, and off-road applications
• Fully welded 16-gauge aluminized steel construction for durability
• Aggressive exterior exhaust tone with a noticeable interior sound
• Chambered design with no internal packing to blow out
• Universal fitment may require exhaust system adaptation

Features:

• Sound: Produces the aggressive exterior and interior exhaust tone associated with the original Flowmaster 40 Series sound
• Construction: Made from durable 16-gauge aluminized steel and fully MIG welded for dependable service
• Application: Suitable for street, strip, and off-road exhaust system projects
• Design: Chambered muffler construction eliminates internal packing that can blow out
• Fitment: Universal muffler design with a 2.50-inch inlet and outlet; some adaptation may be required