Flowmaster 40 Series muffler body delivers bold, aggressive exhaust tone.
Flowmaster 40 Series muffler sound close-up highlights signature bark.
Flowmaster 40 Series two-chamber design detail for enhanced exhaust note.
Flowmaster 40 Series muffler inlet/outlet area for versatile installation.
Flowmaster 40 Series two-chamber layout supports muscle cars and street rods.
Flowmaster 40 Series uses 16-gauge aluminized steel for durability.
Flowmaster 40 Series mounted on a muscle car for aggressive tone.
Flowmaster 40 Series universal fit enables easy modification.
Flowmaster 40 Series muffler on a strip build for performance appeal.
Flowmaster 40 Series muffler body delivers bold, aggressive exhaust tone.
Flowmaster 40 Series muffler sound close-up highlights signature bark.
Flowmaster 40 Series two-chamber design detail for enhanced exhaust note.
Flowmaster 40 Series muffler inlet/outlet area for versatile installation.
Flowmaster 40 Series two-chamber layout supports muscle cars and street rods.
Flowmaster 40 Series uses 16-gauge aluminized steel for durability.
Flowmaster 40 Series mounted on a muscle car for aggressive tone.
Flowmaster 40 Series universal fit enables easy modification.
Flowmaster 40 Series muffler on a strip build for performance appeal.

Flowmaster 40 Series Original Chambered Muffler – 3.00 in Offset In / 3.00 in Center Out | Aggressive Sound, 16-Gauge Aluminized Steel

Overview Flowmaster’s 40 Series Original Chambered Muffler delivers a bold, unmistakable exhaust note that enthusiasts recognize. Built...
Vendor: Flowmaster
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£144.80
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Flowmaster 40 Series muffler body delivers bold, aggressive exhaust tone.

Flowmaster 40 Series Original Chambered Muffler – 3.00 in Offset In / 3.00 in Center Out | Aggressive Sound, 16-Gauge Aluminized Steel

£144.80
Flowmaster 40 Series muffler body delivers bold, aggressive exhaust tone.
Flowmaster 40 Series muffler sound close-up highlights signature bark.
Flowmaster 40 Series two-chamber design detail for enhanced exhaust note.
Flowmaster 40 Series muffler inlet/outlet area for versatile installation.
Flowmaster 40 Series two-chamber layout supports muscle cars and street rods.
Flowmaster 40 Series uses 16-gauge aluminized steel for durability.
Flowmaster 40 Series mounted on a muscle car for aggressive tone.
Flowmaster 40 Series universal fit enables easy modification.
Flowmaster 40 Series muffler on a strip build for performance appeal.

Flowmaster 40 Series Original Chambered Muffler – 3.00 in Offset In / 3.00 in Center Out | Aggressive Sound, 16-Gauge Aluminized Steel

£144.80
Description
Description
x

Overview

Flowmaster’s 40 Series Original Chambered Muffler delivers a bold, unmistakable exhaust note that enthusiasts recognize. Built to withstand heat and vibration, this muffler brings a confident street presence to a variety of builds—from classic muscle cars to modern strip machines.

Core design and benefits

  • LEGENDARY SOUND: The original Flowmaster tone is known for a loud, aggressive bark with clear presence on startup and at RPMs.
  • TWO-CHAMBER INTERNAL DESIGN: A classic, proven layout that reinforces a muscular exhaust note ideal for performance-focused applications.
  • PROVEN PERFORMANCE: Improved airflow and reduced back pressure can contribute to crisper throttle response and a more engaging drive.
  • BUILT TO LAST: 16-gauge aluminized steel construction, fully MIG-welded, designed to endure heat and vibration without relying on internal packing.
  • NO INTERNAL PACKING: A packing-free design helps prevent flutter or degradation over time, reducing maintenance needs.
  • UNIVERSAL FITMENT: Compatible with custom and modified exhausts, offering multiple inlet/outlet configurations for center or offset setups.

Durability, fitment, and ease of install

The Flowmaster 40 Series is crafted for longevity, with robust welds and corrosion-resistant steel. Its universal fitment approach means installers can adapt it to a wide range of exhaust systems, making it a practical choice for modified builds, retrofits, or upgrades to existing layouts.

Real-world use and experience

Whether you’re reviving a classic muscle car, building a street rod, towing duties, or pursuing a stripped-down performance ride, this muffler delivers a distinctive auditory character that owners describe as bold and satisfying. Pairing the 40 Series with complementary piping and a tailored exhaust path can help you achieve a balanced, assertive tone without overwhelming cabin noise on longer trips.

What to expect on the road

  • Noticeable, aggressive tone that enhances curb appeal and driving presence.
  • Durable construction designed to hold up to spirited driving and challenging environments.
  • Flexible installation options that suit many custom or modified exhaust systems.

Ideal setups

Best suited for muscle cars, street rods, trucks, SUVs, and strip builds where a classic, powerful exhaust character and durable construction are desired. The range of inlet/outlet configurations supports center or offset arrangements for easier integration into existing systems.

FAQ

Q: What vehicles is the Flowmaster 40 Series most suitable for?

A: Muscle cars, street rods, trucks, SUVs, and strip builds; adaptable to custom exhaust setups.

Q: Is there internal packing inside this muffler?

A: No internal packing is used; construction relies on a welded two-chamber design for lasting sound.

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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