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Flowmaster

Flowmaster 40 Series Original Chambered Muffler – 3.00” Center In / 2.50” Dual Out – Aggressive Sound – 16-Gauge Aluminized Steel – For Muscle Cars, Street Rods, Trucks, SUVs & Strip Builds (430402)

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Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Jun 6
Order within 20 hours and 18 minutes
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Color: Center In / Dual 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.

Brand: Flowmaster


Material: Alloy Steel


Item dimensions L x W x H: 20.4 x 4.6 x 9.9 inches


Vehicle Service Type: Car


Item Weight: 10.1 Pounds


Item Dimensions: 20.4 x 4.6 x 9.9 inches


Item Weight: 10.1 Pounds


Compatible with Vehicle Type: Car


Configuration: Center/Dual


OEM Equivalent Part Number: 430402


Automotive Fit Type: Universal Fit


Part Interchange Info: 430402


Material Type: Alloy Steel


Shape: Oval


Brand Name: Flowmaster


Manufacturer Part Number: 430402


UPC: 700042010448 700042029464


Manufacturer: Flowmaster


Global Trade Identification Number: 48, 64


Model Number: 430402


Item Type Name: Flowmaster 430402 40 Series Muffler - 3.00 Center IN / 2.50 Dual OUT - Aggressive Sound


Included Components: Flowmaster 430402 40 Series Muffler - 3.00 Center IN / 2.50 Dual OUT - Aggressive Sound


Unit Count: 1.0 Count


Manufacturer Warranty Description: Check with the manufacturer


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Jun 6

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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Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Quality
Color: Center In / Dual Out
Did the job, I'm very impressed how it sounds on my particular vehicle, I was worried about it sounding like a fart can but it definitely is far from that. I definitely recommend flowmaster if you like a nice deep rumble
Reviewed in the United States on April 27, 2026 by John
    • Great product
Color: Center In / Dual Out
Excellent product from a exceptional company, sounds amazing
Reviewed in the United States on December 11, 2025 by Redbul71
    • Sounds good great tone
Color: Center In / Dual Out
Exactly what I was looking for
Reviewed in the United States on December 4, 2025 by cody + Dakoda ❤️💋
    • Worth the money, especially if you can weld.
Color: Center In / Dual Out
Installed this on my 2015 Hemi Dodge Ram. Sounds fantastic. Throaty and aggressive but not overwhelmingly loud. I wanted something that just let me hear that Hemi without pissing off the neighbors. With this muffler you need a single 3” pipe (I think it was 16 or 18” long, bought from pep boys for $16) and two 2.5” couplers that step down to 2.25” (2.25 is a the stock exhaust pipe size after the muffler.) I’m a very amateur welder, with an amazon special $100 mug welder, but I welded them on after mocking it up and tac welding them in place, then you can fully weld off-vehicle. Then all I had to do was use one 3” band clamp and two 2.25” band clamps to put it on. Whole process took about 3-4 hours because I’m slow. Would buy again. ... show more
Reviewed in the United States on December 19, 2020 by Tom
    • Just right.
Color: 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
    • Flow master
Color: Center In / Dual Out
Love the sound
Reviewed in the United States on June 20, 2025 by Rico fuller
    • Deep Sound
Color: Center In / Dual Out
I was looking for this in a 3inch dual out but the 2.50 definitely does the job. I think its definitely gotten louder since I bought it a month ago, some people may disagree. Not too bad on inside drone..You can hear it the most around 1700-2000 RPM, pretty much right before it wants to shift or at about 77MPH. I bought this for my 2002 chevy silverado 1500 5.3l V8. If I did this again though I would make my exhaust true dual and still use the 40 series ... show more
Reviewed in the United States on August 2, 2013 by Chris
    • Sounds awesome
Color: Center In / Dual Out
I already had a flow master on my truck and it was quite. This one has a good rumble to it. I would definitely buyit again
Reviewed in the United States on September 29, 2024 by Bill H.

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