Flowmaster Super 40 chambered silencer 3.00" centre inlet / offset outlet — deep tone, reduced cabin drone

Flowmaster Super 40 Series Chambered Muffler (3.00" center in / offset out) delivers a bold, deep exhaust tone with reduced in-cabin resonance for street-driven performance cars and trucks.

Built to bring legendary Flowmaster sound to high-torque engines, the Super 40 combines a chambered Delta Flow design with 16-gauge aluminized steel construction. It’s sized and tuned for muscle cars, trucks, and street rods that need strong flow, improved scavenging, and durability under aggressive driving. This model features a 3.00" center inlet and an offset outlet to simplify routing in custom exhaust systems while maintaining the Super 40’s signature growl.

How does this muffler change my vehicle’s sound without excessive cabin drone?

The Super 40 is engineered to deepen exhaust tone while limiting uncomfortable resonance inside the passenger compartment. Its chambered Delta Flow internals tune harmonic frequencies so you get a powerful rumble at wide-open throttle and a controlled, refined note during cruising.

• Chambered Delta Flow design to manage harmonics and scavenging.
• Reduced in-cabin resonance at highway speeds compared to straight-through designs.
• Pronounced low-frequency tone under acceleration for that muscle car character.

Will this fit my build and how easy is it to install?

This Super 40 is made for universal fitment and offered in a variety of inlet/outlet sizes; the case measures 13.0" L x 10" W x 5.0" H. The 3.00" center inlet and offset outlet provide flexibility for routing on many chassis layouts, making it straightforward to adapt into custom and replacement systems.

• 3.00" center inlet with offset outlet for versatile piping paths.
• Compact case size suited to tight underbody locations.
• Can be welded or clamped into custom exhausts; common hardware fittings apply.

What materials and construction ensure durability under performance use?

Flowmaster builds the Super 40 with 16-gauge aluminized steel and full MIG welding to withstand heat, vibration, and road conditions typical of spirited driving. The finish and weld quality focus on long service life while keeping costs reasonable for performance enthusiasts.

• 16-gauge aluminized steel resists corrosion and heat damage.
• Fully MIG-welded seams for structural strength under stress.
• Robust internals designed to handle high flow and backpressure demands.

How does the Super 40 benefit different engine platforms?

The design complements high-torque small-blocks, modern HEMIs, and LS swaps by enhancing scavenging and throttle response without sacrificing the classic Flowmaster voice. It’s tuned to support acceleration and midrange torque that drivers feel on the street and at the strip.

• Improves scavenging to help midrange torque and throttle response.
• Works well with both carbureted and fuel-injected performance engines.
• Recommended for muscle cars, trucks, and street rods with aggressive exhaust needs.

Who is this for: The Flowmaster Super 40 Series 3.00" center in/offset out muffler is aimed at enthusiasts building or upgrading performance exhausts on muscle cars, classic small-block and modern HEMI projects, LS conversions, and street-driven trucks or hot rods. If you want a deeper, more powerful exhaust note with minimized cabin drone, durable construction, and flexible fitment for custom routing, this muffler is a strong option.