Flowmaster 40 Series original muffler delivers bold tone for muscle cars and street rods.
Close-up of Flowmaster two-chamber design highlighting aggressive exhaust character.
Flowmaster 16-gauge aluminized steel body emphasizes durability under heat and vibration.
Flowmaster 2-50-inch inlet/outlet configuration enables flexible exhaust setups.
Flowmaster MIG-welded joints showcase rugged construction for long-lasting performance.
Flowmaster bold exhaust tone captured on a muscle car at idle.
Flowmaster muffler installed undercarriage with universal fitment advantages.
Flowmaster for muscle cars and street rods offers an aggressive yet controlled sound.
Flowmaster end-cap and muffler body built to endure high-heat environments.
Flowmaster 40 Series original muffler delivers bold tone for muscle cars and street rods.
Close-up of Flowmaster two-chamber design highlighting aggressive exhaust character.
Flowmaster 16-gauge aluminized steel body emphasizes durability under heat and vibration.
Flowmaster 2-50-inch inlet/outlet configuration enables flexible exhaust setups.
Flowmaster MIG-welded joints showcase rugged construction for long-lasting performance.
Flowmaster bold exhaust tone captured on a muscle car at idle.
Flowmaster muffler installed undercarriage with universal fitment advantages.
Flowmaster for muscle cars and street rods offers an aggressive yet controlled sound.
Flowmaster end-cap and muffler body built to endure high-heat environments.

Flowmaster 40 Series Original Chambered Muffler – 2.50\" Offset In/Out – Aggressive Sound | 16-Gauge Aluminized Steel – 42543

Unmistakable Tone and Built to Last The Flowmaster 40 Series Original Chambered Muffler delivers the legendary, aggressive...
Vendor: Flowmaster
Availability: In stock
£144.80
£144.80
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Flowmaster 40 Series original muffler delivers bold tone for muscle cars and street rods.

Flowmaster 40 Series Original Chambered Muffler – 2.50\" Offset In/Out – Aggressive Sound | 16-Gauge Aluminized Steel – 42543

£144.80
Flowmaster 40 Series original muffler delivers bold tone for muscle cars and street rods.
Close-up of Flowmaster two-chamber design highlighting aggressive exhaust character.
Flowmaster 16-gauge aluminized steel body emphasizes durability under heat and vibration.
Flowmaster 2-50-inch inlet/outlet configuration enables flexible exhaust setups.
Flowmaster MIG-welded joints showcase rugged construction for long-lasting performance.
Flowmaster bold exhaust tone captured on a muscle car at idle.
Flowmaster muffler installed undercarriage with universal fitment advantages.
Flowmaster for muscle cars and street rods offers an aggressive yet controlled sound.
Flowmaster end-cap and muffler body built to endure high-heat environments.

Flowmaster 40 Series Original Chambered Muffler – 2.50\" Offset In/Out – Aggressive Sound | 16-Gauge Aluminized Steel – 42543

£144.80
Description
Description
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Unmistakable Tone and Built to Last

The Flowmaster 40 Series Original Chambered Muffler delivers the legendary, aggressive bark that enthusiasts associate with Flowmaster. Built to endure heat and vibration, it maintains a bold street presence without sacrificing everyday drivability. This muffler is designed to complement muscle cars, street rods, trucks, SUVs, and strip builds with a recognizable, confident exhaust character.

Key design and performance benefits

  • Bold, aggressive exhaust tone achieved through Flowmaster’s classic chambered layout that fans recognise.
  • Two-chamber internal design reinforces the signature sound while staying true to the original lineage.
  • Proven airflow design aims to reduce back pressure, potentially supporting improved throttle response and responsiveness.
  • Durable build uses 16-gauge aluminized steel and full MIG welding to withstand heat and vibration without relying on internal packing.

Durable build and simple installation

  • No internal packing to wear out, helping maintain consistent sound quality over time.
  • MIG-welded joints provide rugged, long-lasting construction for demanding drives.
  • Universal fitment with multiple inlet/outlet sizes and configurations (center/offset, dual) to simplify installation and optimize fit.

Versatile fit for a wide range of builds

Designed for custom and modified exhaust systems, this muffler suits muscle cars, street rods, trucks, SUVs, and strip builds. It offers a bold, unmistakable presence while allowing you to tailor the setup to your vehicle’s needs.

FAQ

Q: What vehicles is the Flowmaster 40 Series Original Muffler best suited for?

A: Ideal for muscle cars, street rods, trucks, SUVs, and strip builds seeking a bold, aggressive exhaust presence.

Q: Does this muffler require packing or maintenance?

A: No internal packing to wear out; it uses a durable two-chamber design and MIG-welded construction.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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