Description
Overview
The Flowmaster 40 Series Chambered Muffler is the muffler that started it all — the original performance muffler engineered to deliver that unmistakable, aggressive Flowmaster sound both inside and outside the cab. If you’ve been chasing that signature deep, loud tone, the Flowmaster 40 Series is built to give you exactly that. As the Original 40 Series design, it remains one of the most recognizable performance mufflers in the game, delivering a genuine flowmaster exhaust attitude that lets everyone know your truck or SUV means business.
Built for durability from the inside out, this flowmaster muffler is constructed of 16-gauge 409S stainless steel and fully MIG welded for maximum strength and long service life. That rugged construction stands up to the heat and vibration of daily driving and hard use, making it a dependable exhaust muffler for the long haul. A high-temperature paint finish helps the muffler resist the punishing under-vehicle environment.
Sound & Performance
The 40 Series is all about attitude. Its chambered design produces an aggressive sound level with a raw, powerful exterior tone and a bold interior note — the classic flowmaster 40 character that made the flowmaster company a household name among enthusiasts. If you want your car muffler to be heard, this is the performance muffler that delivers that original Flowmaster growl.
Key Highlights
- Original 40 Series chambered design for the classic, aggressive Flowmaster tone
- 16-gauge 409S stainless steel construction, fully MIG welded for maximum durability
- High-temperature paint finish to withstand under-vehicle heat
- 2.25″ inlet diameter with a 9.50″ body width
- Universal fitment engineered for Truck/SUV applications
- Aggressive sound level — both interior and exterior tone
Fitment & Installation
This is a universal-fit muffler designed for Truck/SUV vehicle types, giving fabricators and installers flexibility when building or upgrading a flowmaster exhaust system. It features a 2.25″ inlet diameter and a 9.50″ body width. Please note the muffler uses new hangers, which are not included, and exhaust tips are sold separately — plan your build accordingly to complete your setup.
Whether you’re piecing together a full flowmaster exhaust system or simply swapping in a new exhaust muffler to wake up your ride, the 40 Series is a proven choice among flowmaster exhaust systems and performance mufflers alike. It carries an emission code of 5 and includes a California Proposition 65 warning. Add the original flowmaster 40 series muffler to your build and get the aggressive, iconic sound that made these mufflers legendary.
