Flowmaster 2.50IN(C)/OUT(O) 40 Series Muffler

The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability. 40 Series - 2.50" IN(C)/OUT(O) - Aggressive Sound Universal Muffler - Some adaptation may be required.

• Excellent Street/Strip and Off Road application
• Durable fully welded 16 gauge aluminized steel
• Aggressive Sound Exterior Exhaust Tone
• No internal packing to blowout

The Flowmaster 42542 40 Series universal muffler delivers the classic, aggressive Flowmaster exhaust tone for street, strip, and off-road applications. Designed for enthusiasts seeking the original 40 Series sound, this muffler produces a forceful exterior and interior exhaust note while maintaining the durable construction required for demanding driving conditions. The 2.5-inch inlet and outlet configuration supports a range of custom exhaust systems, although some adaptation may be required for installation.
Constructed from 16-gauge aluminized steel, the Flowmaster 40 Series muffler is fully MIG welded for dependable strength and long-term durability. Its rugged design is well suited to performance vehicles, custom builds, and off-road applications where reliable exhaust components are essential. The universal fitment allows flexible installation when paired with compatible exhaust tubing, connectors, and mounting hardware.
Unlike packed mufflers, the Flowmaster 42542 uses an internal design with no packing material to blow out over time. This helps maintain its aggressive exhaust character and reduces concerns associated with packing deterioration under extended use. Whether used for a street/strip project or an off-road vehicle, this Flowmaster muffler provides recognizable sound and proven construction in a versatile universal format.

Features:

• Brand: Flowmaster

• Part Number: 42542

• Series: 40 Series

• Inlet and Outlet: 2.5-inch inlet and outlet

• Fitment: Universal muffler; some adaptation may be required

• Application: Suitable for street, strip, and off-road use

• Construction: Durable 16-gauge aluminized steel

• Welding: Fully MIG welded for added durability

• Sound: Aggressive exterior and interior exhaust tone

• Internal Design: No internal packing to blow out