Description
Overview
The Flowmaster 40 Series Delta Flow Chambered Muffler brings proven two-chamber performance and Flowmaster’s signature aggressive tone to your build. Engineered around Delta Flow® technology, this muffler uses internal Delta deflectors to generate increased scavenging, delivering better performance while taming interior sound and resonance. If you want that unmistakable muscle car growl without unwanted drone inside the cabin, the 40 Series Delta Flow strikes a purposeful balance.
Compared to the standard 40 Series, this Delta Flow design produces a milder exterior tone and reduced interior resonance, making it a smart upgrade for drivers who want serious sound with more everyday livability. It remains an aggressive-sounding muffler at its core — perfect for classic muscle cars and performance-minded street builds.
Built to Last
Durability is engineered in from the start. The muffler is constructed of 16 gauge aluminized steel and fully MIG welded for maximum strength and long service life. A high-temperature paint finish helps the housing stand up to the heat and demands of a hard-working exhaust system, so it looks and performs the part mile after mile.
Key Benefits
- Delta Flow® two-chamber design with internal Delta deflectors for increased scavenging and improved performance
- Aggressive exterior sound with reduced interior resonance versus the standard 40 Series
- Rugged 16 gauge aluminized steel body, fully MIG welded for maximum durability
- High-temperature paint finish for heat resistance
- 2.50″ inlet diameter
- Universal fitment for flexible custom exhaust routing
Fitment & Installation
This is a universal-fit muffler with a 2.50″ inlet diameter, giving fabricators and enthusiasts the flexibility to integrate it into a wide range of exhaust configurations. It is designed to use new hangers, which are not included, so plan your mounting hardware accordingly. Exhaust tips are sold separately, allowing you to finish the system exactly the way you want.
With an emission code of 5, the 40 Series Delta Flow is well suited to classic muscle car applications and performance-oriented builds where sound, flow, and durability all matter. Always confirm the muffler works with your intended exhaust layout and dimensions before installation.
Why Choose the 40 Series Delta Flow
Flowmaster’s reputation is built on delivering the tone and performance enthusiasts crave, and the 40 Series Delta Flow carries that tradition forward. It’s a straightforward, hard-hitting choice for anyone looking to add aggressive character to their exhaust while managing interior comfort. Backed by heavy-duty construction and Delta Flow® scavenging technology, it’s a muffler engineered to sound great and hold up to the miles.
