Description
Overview
The Flowmaster Original 40 Series muffler is the piece that started it all, delivering the deep, aggressive tone that made Flowmaster a household name in the world of performance exhaust. If you’re building a Street Rod or upgrading a daily driver and want that unmistakable Flowmaster muffler bark, this is the classic that set the standard. Both inside and out, it produces an aggressive exterior and interior tone that announces your build before it ever comes into view.
When you shop for exhaust, durability matters as much as sound, and this muffler is built to last. It is constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability, then finished in a high-temperature paint that stands up to the heat of a hardworking exhaust system. That combination of thick-gauge steel and complete MIG welding gives you a car exhaust component engineered to survive years of road miles and thermal cycling.
Sound & Performance
The Original 40 Series is all about attitude. Its aggressive sound level makes it a favorite among enthusiasts chasing that original Flowmaster character, whether you’re running it as a stand-alone muffler swap or as the centerpiece of a larger performance exhaust build. Paired with the right piping, this magnaflow-class performance mindset applies here too: the muffler serves as the tone-defining heart of your car exhaust setup.
Key Highlights
- Original 40 Series design for the classic, aggressive Flowmaster muffler tone
- 16 gauge aluminized steel construction, fully MIG welded for maximum durability
- High-temperature paint finish to handle real exhaust-system heat
- 2.50-inch inlet diameter with a dual inlet location
- 9.50-inch body width for a compact, familiar footprint
- Universal fitment, ideal for Street Rod applications and custom builds
Specifications & Fitment
This muffler features a 2.50-inch inlet diameter, a dual inlet location, and a 9.50-inch body width, making it a versatile choice for fabricators piecing together a custom exhaust system. Its universal fitment gives you the flexibility to integrate it into a wide range of Street Rod and custom exhaust automobile projects, whether you’re planning a full custom routing or simply refreshing the mufflers on an existing setup. It carries an Emission Code of 5, so verify local requirements for your application.
Configuration
Exhaust tips are sold separately, so you can finish your build with the tip style that matches your vision. Whether you’re assembling a complete performance exhaust from scratch or upgrading the muffler on your current car exhaust, the Original 40 Series delivers proven Flowmaster tone and construction. Choose this muffler when you want the authentic sound, rugged aluminized-steel build, and universal flexibility to make it your own.
