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The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.
From the Manufacturer
Make that Dodge streetcar (1960 1976) roar louder than any car on the strip with a 40 Series muffler from Flowmaster. The most aggressive sounding street and strip muffler in its class, the 40 series still has that original Flowmaster tenor, but with a deep inside-the-car resonance that'll make any Dodge owner smile. Inside you feel the thunder; outside you hear it.
FEATURES
- Custom designed for Dodge streetcars (1960 1976) for a perfect fit
- Center Outlet: 2-1/2 inches for optimal exhaust release
- Most aggressive sounding street and strip muffler in its class for head-turning thunder
- Deep interior resonance for uninhibited conversation about the car
SPECIFICATIONS
- Applications: Off-road driving and racing
- Offset Inlet: 2-1/2 inches
- Center Outlet: 2-1/2 inches
- Overall dimensions: 4 x 9 3/4 x 19
- Case Length: 13 inches
- Shape: Oval
Britt
2025-08-05 12:30:31
Perfect amount of sound for me a 35 year old. Great idle, great sound when giving it just a little gas and on the highway. Left my resonator on and so I haven’t noticed any drone on the highway with the radio on just on low volume. Would buy again.
John Bodzo Jr
2025-07-18 10:51:31
I always use these flowmaster on my V8's f150's...great sound and performance..
Brenda Monn
2025-06-25 17:56:30
Good quality and easy to install. Love the way it sounds.
El Sob
2025-05-31 16:13:32
I have been chasing this sound for many years. I finally have it. I am extremely happy with the mufflers 😇
Toobroketoretire
2025-05-24 17:43:47
I'm running a 454" powered '71 Corvette that has a high-performance factory cam, a high-rise Edelbrock intake, and a 3310-2 Holley carburetor. Up until now I had a set of stock mufflers on it and it would fall flat on it's face at around 3600 rpm. After installing these 40-Series Flowmasters it blasts up to it's 5500 rpm red line with no signs of exhaust restriction whatsoever. And as I'm also running a heavily-modified TH700R4 the amount of exhaust drone at cruising speeds is very small. For those of you who want a very decent street/strip muffler at an affordable price these 40-Series Flowmasters are the way to go. And with the free shipping they're even better.
jimbo
2025-05-06 13:14:38
Easy install...sounds great...no inside cab droan...definitely more power
Salvador Ruiz Torres
2025-03-19 18:10:14
The media could not be loaded.
Daniel M.
2025-03-17 18:20:13
I bought this muffler for my 2011 F-150 5.0 Super Crew. I kept the stock resonator on and had a turn down right after the rear axle. I kept the resonator because I have a 6 month old and I did not want it to be too loud. It has a nice smooth tone, and you know it's there when driving and idling. I gave it four stars because as soon after I put it on my gas mileage dropped 2-3 mpg, and no it's not from led footing it. I was driving the speed limit and using cruise control. After a couple of days of driving my mileage was back to normal. Guess it just took a couple of days for all 123 computers on the truck to learn something was different. But it has a great deep sound.
Roy
2025-03-15 15:20:59
Love the sound. Not overly loud just a very nice throaty sound.
kresta
2025-03-05 12:19:00
I bought this for my 2016 Ford F150 V6. Even though is says it doesn't fit pipes can be made to make it fit. It has a nice throaty sound at idle and up to 5000 rpms on a V6. Much better than the stock muffler. I also deleted the resonator. Good product
Godmodeon
2025-02-16 11:51:02
It’s a flowmaster muffler.. they sound great.. they work great.. they last. What more can I say other then you won’t be disappointed and the sound will always make you smile.
lb
2025-01-28 13:37:36
Perfect!
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