Description
Overview
The Flowmaster 40 Series Chambered Muffler is the muffler that defined the signature Flowmaster sound. As part of the Original 40 Series, this flowmaster muffler delivers an aggressive exterior and interior tone that has become the benchmark for classic muscle car exhaust. If you’re chasing that unmistakable original Flowmaster exhaust growl, this performance muffler is built to deliver it.
Flowmaster engineered this exhaust muffler with a fully chambered design that produces a deep, aggressive sound level without sacrificing durability. It’s the kind of car muffler that announces itself the moment you fire the engine, making it a natural centerpiece of any flowmaster exhaust system on a classic muscle car build.
Built to Last
Construction is where this flowmaster 40 series muffler earns its reputation. It’s built from 16 gauge 409S stainless steel and fully MIG welded for maximum durability, so it stands up to heat, vibration, and years of hard driving. A high-temperature paint finish adds an extra layer of protection against the elements. With a 9.50-inch body width, a 3.00-inch inlet diameter, and a dual outlet location, it’s designed to integrate cleanly into a performance-focused exhaust setup.
Key Benefits
- Original 40 Series chambered design for that classic, aggressive Flowmaster tone inside and out
- 16 gauge 409S stainless steel, fully MIG welded for long-term durability
- High-temperature paint finish for added protection under demanding conditions
- 3.00-inch inlet with dual outlet location for a purposeful exhaust layout
- 9.50-inch body width sized for classic muscle car applications
- Universal fitment for flexible integration into custom exhaust builds
Fitment & Installation
This flowmaster muffler features universal fitment, making it a versatile choice for classic muscle car projects and custom exhaust muffler car applications. Installation uses new hangers, which are not included, so plan your mounting hardware accordingly. Exhaust tips are sold separately, giving you the freedom to finish the look exactly how you want it. Please note this product carries a California Proposition 65 warning and falls under Emission Code 5.
Why Choose the 40 Series
Flowmaster company built its reputation on performance mufflers that combine a bold sound with real-world toughness, and the 40 Series is the muffler that started it all. Whether you’re restoring a muscle car or building a purpose-driven flowmaster exhaust system from scratch, the Flowmaster 40 delivers the aggressive character enthusiasts recognize instantly. For anyone comparing flowmaster mufflers and exhaust muffler options, the Original 40 Series remains the standard for that authentic, unmistakable Flowmaster growl.
