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Flowmaster

Flowmaster 40 Series Original Chambered Muffler – 3.00” Offset In / 3.00” Offset Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (43043)

  • Based on 447 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Jan 12
Order within 17 hours and 6 minutes
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Style: Offset In / Offset Out


Features

  • LEGENDARY SOUND: This is the original Flowmaster muffler that enthusiasts know and love! Famous for its bold, aggressive bark and signature tone. It delivers the unmistakable attitude and street presence that made Flowmaster a legend.
  • TWO-CHAMBERED INTERNAL DESIGN: Flowmasters classic two-chambered layout delivers that bold, aggressive exhaust sound Flowmaster is known for. Perfect for muscle cars, street rods, trucks, off-road rigs, and custom builds.
  • PROVEN PERFORMANCE: Enhances airflow and reduces back pressure to help boost horsepower, torque, and throttle response.
  • BUILT TO LAST: Made from 16-gauge aluminized steel and fully MIG-welded to withstand high heat and vibration with no internal packing to blow out or wear down.
  • UNIVERSAL FITMENT: Designed for custom and modified exhaust systems, with multiple inlet/outlet sizes and configurations (center/offset, dual) for simplified installation and optimal fit.

Description

The Flowmaster Original 40 Series Muffler is the icon that launched a movement. Designed for enthusiasts who demand bold sound and proven performance, the 40 Series delivers that signature aggressive bark Flowmaster is known for around the world. Ideal for classic muscle cars, modern trucks, off-road rigs, and street builds, this muffler makes a statement that can’t be ignored. Built with Flowmaster’s classic two-chamber internal design, it improves exhaust flow to boost torque and horsepower while delivering that throaty, attention-grabbing tone under acceleration. Constructed from durable 16-gauge aluminized steel and fully MIG-welded, the 40 Series is built to handle high heat, vibration, and tough road conditions without internal packing to break down. Offered in a variety of inlet/outlet sizes and configurations (center/offset, dual), the Original 40 Series supports a wide range of custom or modified exhaust setups. Features: Classic two chambered design for aggressive bark and proven performance Throaty, high-impact sound for street and performance builds 16-gauge aluminized steel construction for lasting durability Fully MIG-welded to withstand high heat and vibration Universal fit options for custom and modified exhaust systems

Brand: Flowmaster


Item dimensions L x W x H: 20 x 10 x 4.5 inches


Vehicle Service Type: Car


Shape: Oval


UPC:


Brand: ‎Flowmaster


Item dimensions L x W x H: ‎20 x 10 x 4.5 inches


Vehicle Service Type: ‎Car


Shape: ‎Oval


UPC: ‎700042010424


Manufacturer: ‎Flowmaster


Global Trade Identification Number: ‎24


OEM Part Number: ‎43043


Automotive Fit Type: ‎Universal Fit


Model: ‎43043


Item Weight: ‎8.55 pounds


Product Dimensions: ‎20 x 10 x 4.5 inches


Item model number: ‎43043


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Painted


Manufacturer Part Number: ‎43043


Date First Available: February 9, 2007


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Jan 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Sounds good great tone
Style: Center In / Dual Out
Exactly what I was looking for
Reviewed in the United States on December 4, 2025 by cody + Dakoda ❤️💋
    • Just right.
Style: Center In / Dual Out
Like new in the box, i was worried do to it being a return, however, it was just what I needed. Thank you Amazon and seller.
Reviewed in the United States on September 5, 2025 by AZ-agent103
    • Deep sound and very low priced.
Style: Offset In / Offset Out
This muffler was cheap. It had a nice painted black finish and a deep sound. When I installed it though it made the port for outgoing exhaust on the wrong side, not closest to the frame. But overall satisfied.
Reviewed in the United States on July 21, 2025 by Jay Rose
    • Classic Muscle Sound
Style: Center In / Center Out
Awesome sound on BBC.
Reviewed in the United States on September 18, 2025 by shane young
    • 👍🏼
Style: Offset In / Offset Out
Sounds great
Reviewed in the United States on November 2, 2025 by John
    • Sounds Mean
Style: Offset In / Offset Out
Wow, let me tell you about the Flowmaster 43043 40 Series Chambered Muffler - it's an absolute game-changer for anyone looking to take their ride to the next level! From the moment you start up your engine, you can feel the power and performance that this muffler brings to the table. It's like music to my ears every time I rev my engine with this bad boy installed. The deep, throaty growl is enough to send shivers down your spine and will have heads turning wherever you go. Not only does it sound amazing, but the performance gains are out of this world. The Flowmaster 43043 40 Series Chambered Muffler delivers a noticeable boost in horsepower and torque, giving your vehicle that extra oomph it needs to really stand out on the road. It's super easy to install, so you can have it on your car and be ready to hit the streets in no time. Trust me, once you experience the power and performance of the Flowmaster 43043 40 Series Chambered Muffler, you'll wonder how you ever drove without it. This muffler is a must-have for any car enthusiast looking to take their ride to the next level ... show more
Reviewed in the United States on December 10, 2024 by justin
    • On time
Style: Center In / Center Out
They were fine received them as they said
Reviewed in the United States on August 28, 2025 by Sandra
    • Great
Style: Center In / Center Out
Sounds amazing
Reviewed in the United States on May 20, 2025 by terry

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