Flowmaster Super 40 Chambered Muffler — 3.00" Center In / Offset Out, Delta Flow, 16‑ga Aluminized

Flowmaster Super 40 Series Chambered Muffler (3.00" center in / offset out) is a premium chambered muffler built to deliver a bolder, deeper exhaust note while reducing interior resonance for high-torque street and performance vehicles.

This Super 40 Series muffler refines the classic 40 Series tone into a deeper, more commanding voice without sacrificing drivability. Designed around Flowmaster's Delta Flow chambered architecture, it improves scavenging and gas flow for stronger throttle response and acceleration characteristics. Constructed from 16-gauge aluminized steel with full MIG welds, the unit balances durability for spirited driving with a refined on-road sound profile. The case measures 13.0" L x 10" W x 5.0" H and is offered in a 3.00" center inlet with an offset outlet to suit custom routing on muscle cars, trucks, and street rods.

How does this muffler change the sound compared to stock?

The Super 40 deepens and loudens the signature 40 Series tone while targeting cabin resonance for a more enjoyable driving experience. It emphasizes low-end growl without adding excessive drone at cruising speeds.

• Deeper, more aggressive low-frequency exhaust note.
• Delta Flow chambers reduce in-cab resonance at highway speeds.
• Retains a refined street-friendly character for daily driving.

Will it fit my vehicle and setup?

Flowmaster offers this muffler in multiple inlet/outlet sizes and configurations; the model here is 3.00" center in with an offset out to suit custom piping runs. Confirm pipe diameter and clearance before ordering for a smooth installation.

• 3.00" center inlet, offset outlet configuration for flexible routing.
• Universal-style design works with many custom builds and conversions.
• Check fitment against case dimensions: 13.0" L x 10" W x 5.0" H.

How durable is the construction for performance use?

The Super 40 Series is built from 16-gauge aluminized steel and fully MIG-welded to withstand heat, vibration, and repeated use. It’s engineered to hold up under high-torque and spirited driving scenarios common to muscle cars and trucks.

• 16-gauge aluminized steel resists corrosion better than bare steel.
• Full MIG welds add strength at seams and joints.
• Designed to endure aggressive driving and high exhaust temperatures.

What performance effects should I expect after installation?

This muffler enhances exhaust flow and scavenging which can sharpen throttle response and help with acceleration feel, especially on high-torque engines. It’s tuned for a powerful tone without sacrificing daily drivability.

• Improved scavenging for more efficient exhaust evacuation.
• Sharper throttle response and perceived torque delivery.
• Street-refined sound suited for both cruising and spirited runs.

Who is this for? The Flowmaster Super 40 Series 3.00" center in/offset out muffler is aimed at builders and owners of muscle cars, trucks, and street rods who want a deeper, more forceful exhaust note while minimizing cabin drone. It suits modern HEMI platforms, classic small-block swaps, and LS-powered projects that demand robust flow, durable construction, and a refined street sound. If you’re modifying or upgrading an exhaust system and value tone, longevity, and flexible fitment, this muffler is a strong candidate.