Flowmaster Super 40 Series Chambered Muffler - Deep Aggressive Tone

In this review of the Flowmaster Super 40 Series chambered muffler the bottom line is straightforward: it is aimed at builders who want a bold, deep exhaust tone without excessive cabin drone and a durable unit for high-torque applications. The Super 40 refines the classic 40 Series growl into a deeper, more powerful note while the Delta Flow chambered design improves scavenging and throttle response. For muscle cars, lifted trucks, street rods, and LS or HEMI swaps this muffler delivers purposeful sound and solid construction at a value-oriented price.

Key Features

• Bold, deep sound: Builds on the legendary 40 Series tone to deliver a deeper, more powerful exhaust note suited to performance engines.
• Reduced in-cab resonance: The chambered Delta Flow design helps minimize interior resonance at cruising speeds for a more pleasant driving experience.
• Improved engine response: Enhanced scavenging and airflow support better torque delivery, throttle response, and acceleration in high-torque builds.
• Durable construction: Made from 16-gauge aluminized steel and fully MIG-welded to withstand high heat, vibration, and aggressive driving conditions.
• Universal fit options: Available in multiple inlet and outlet configurations to accommodate a wide range of custom exhaust layouts and modified vehicles.

Who It's For

The Super 40 is best for owners of muscle cars, lifted trucks, street rods, and anyone building a high-torque engine like modern HEMIs, classic small-blocks, or LS swaps who want a deep, aggressive tone with less cabin drone. Installers and hobbyists who value straightforward, durable hardware will appreciate the aluminized steel construction and MIG welds.

Those seeking a totally quiet, subtle exhaust or a stainless-steel lifetime unit should look elsewhere; this muffler prioritizes sound and performance over absolute stealth and uses aluminized steel rather than premium stainless finishes.

Pros & Cons

Pros

• Delivers a deep, muscular tone while keeping cruising resonance in check.
• Improves throttle response and acceleration through Delta Flow chamber design.
• Solid, serviceable build with 16-gauge aluminized steel and full MIG welds.
• Multiple inlet/outlet options make it adaptable to many custom setups.

Cons

• Fitment can be mixed on some custom applications, so careful measurement is required.
• Aluminized steel is durable but not as corrosion-resistant long-term as stainless steel.

Specifications

Product	Super 40 Series Chambered Muffler
Sound Character	Bold, deep with reduced in-cab resonance
Design	Delta Flow chambered
Material	16-gauge aluminized steel, fully MIG-welded
Intended Use	Muscle cars, trucks, street rods, high-torque builds
Fitment	Multiple inlet/outlet sizes and configurations (universal options)
Case Dimensions	13.0 L x 10 W x 5.0 H (in)

Our Verdict

The Flowmaster Super 40 Series is a strong choice for enthusiasts who want a deep, aggressive exhaust note combined with improved throttle response and reduced cabin drone. It offers durable construction and versatile fitment at a sensible price, making it good value for muscle car and truck builds, while those seeking stainless finishes or absolute silence should consider alternatives.

Frequently Asked Questions

Will this muffler reduce interior drone?
The Delta Flow chambered design is specifically intended to minimize in-cab resonance at cruising speeds, so most drivers report reduced interior drone compared with louder straight-through designs.

Is this muffler a direct bolt-on?
Fitment varies by vehicle and chosen inlet/outlet configuration; some customers report perfect fit while others needed minor modifications, so measure your pipe sizes and layout before ordering.

What materials and welding are used?
This model uses 16-gauge aluminized steel and is fully MIG-welded for durability under heat and vibration common to high-torque applications.