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Flowmaster Original 40 Series Mufflers

96 Reviews
$95.20 - $108.00
List Price
$85.68 - $96.39
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Flowmaster Original 40 Series Mufflers

Center Inlet / Dual Outlet

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$95.20 - $108.00
List Price
$85.68 - $96.39
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    Offset Inlet / Center Outlet

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    $95.20 - $108.00
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    $85.68 - $96.39
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      Offset Inlet / Offset Outlet

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      $95.20 - $108.00
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      $85.68 - $96.39
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        Center Inlet / Offset Outlet

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        $95.20
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        $85.68
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          Dual Inlet / Dual Outlet

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          $95.20
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            Features:
            • The Flowmaster Original 40 Series Muffler takes the checkered flag as Flowmaster's most aggressive-sounding muffler
            • Crafted from aluminized steel for corrosion resistance and precision mig welded for maximum durability
            • Perfect for early muscle cars, off-road & race vehicles and dual-exhaust rides
            • Hear the power of your engine with the excellent interior resonance of the 40 Series—especially at 1800-2000 RPMs and again at 2400-2600 RPMs
            • Original two-chamber design maximizes horsepower and torque
            • The centerpiece muffler for many Flowmaster American Thunder Exhaust Systems
            • Casing embossed with the Flowmaster name
            • Your Flowmaster Original 40 Series Muffler carries a 3-year warranty
            Description:

            Get the original aggressive Flowmaster sound that puts serious punch into your vehicle's presence and power. The Flowmaster Original 40 Series Muffler maximizes horsepower, torque and flow with its two-chamber design-the original two-chamber Flowmaster muffler.

            If the roaring sound of an engine is music to your ears, you'll love the Flowmaster 40 Series. Aggressive sound is maximized outside, while high-volume interior resonance lets you hear every push of the pedal. It's this total sound design that makes the Flowmaster 40 Series the centerpiece of many of Flowmaster's outstanding American Thunder Exhaust Systems.

            Ideal for early muscle cars, off-road rides and dual exhaust cruisers, the Flowmaster Original 40 boasts the quality construction you'd expect from Flowmaster. Each Flowmaster muffler is built with 16-gauge aluminized steel for corrosion resistance and fully mig-welded for maximum durability. Best yet, your Flowmaster Original 40 Series Muffler boasts a 3-year warranty.

            Notes:
            • Flowmaster Original 40 Series Mufflers come in a variety of inlet/outlet configurations and sizes, shown above. Select the inlet/outlet diameter you need from the drop down at right.
            • ATTN: State of California Consumers
              warning symbolWARNING: This product can expose you to chemicals including nickel (metallic) and chromium (hexavalent compounds) which are known to the State of California to cause cancer and birth defects, or other reproductive harm (For more information go to www.p65warnings.ca.gov)
            Average Rating
            Appearance
            Ease of Installation
            Price/Value
            Quality
            96 Customer Reviews
            5 Star
            79 (82%)
            4 Star
            15 (16%)
            3 Star
            2 (2%)
            2 Star
            0 (0%)
            1 Star
            0 (0%)

            She roars

            Made a very good improvement in sound then what I had on my car prior. It rumbles and echoes the neighborhood when I drive.
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            Posted By Paul D (Taylor, MI) / May 23, 2019
            2006 Dodge Charger
            Yes
            No

            Sound

            Nice muffler I replaced the super 44 with the original 40 not as loud or deep as the 44. I will be putting the super 44 back on.
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            Posted By michael t (MUNCY, PA) / October 26, 2018
            2012 Dodge Ram
            Yes
            No

            2016 GMC Sierra

            I installed this by removing everything from the stock muffler back. Installed the series 40 exactly where the original muffler was and had exit pipe turn out just in front of the rear tire. Unless you were in the throttle really hard, you couldnt tell if it was a V8 or the V6.
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            Posted By Chris N (Las Cruces, NM) / June 13, 2018
            2016 GMC Sierra
            Yes
            No

            YOU WILL NOT BE DISAPPOINTED

            basically you know why you want this item, you want sound and notice abilities. You will get that with this product. This is a great product, I fully stand by flowmaster, I've had flowmaster for 25 + years and it's a great feeling each time. Big thanks to flowmaster.
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            Posted By Edward H (BELLMORE, NY) / June 13, 2018
            Yes
            No

            Replaced original

            I got the pipe diameter and size of the original muffler, then ordered this one based on required size. The original system was stainless and both pipes were in very good shape, so I was looking for a replacement muffler that as not going to break the bank. The vehicle is 18 years old, so the only other parts that I found were CAT-back with both pipes included priced almost 6X the muffler alone. The old muffler was cut out and this one welded in, and the system is good as new.
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            Posted By James W (EDMONDS, WA) / May 10, 2018
            2001 Nissan Frontier
            Yes
            No

            Flowmaster review

            I just replaced my original flowmaster after ten years of use and it sounded great and so does this new one!!!!!
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            Posted By John S (TENNESSEE COLONY, TX) / February 7, 2018
            1993 Chevy C/K 3500
            Yes
            No

            Acceleration

            Since I add the 40 series Muffler to my Dodge performance is much better I actually can feel it when I accelerate.
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            Posted By Stan G (Lawrenceville, GA) / December 19, 2017
            2008 Dodge Ram
            Yes
            No

            Great

            Sounds good. not too loud but still has a rumble
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            Posted By Izaak J (KETCHIKAN, AK) / October 16, 2017
            2004 Chevy Silverado
            Yes
            No

            Nice but not what I expected

            This muffler was rated to give a loud, deep, aggressive sound. Installed it on my 2012 Dodge Ram 2500. It's a lot quieter than I expected. Hoping that taking the resonator off will help. Nice muffler though and there price was reasonable.
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            Posted By Cindy S (BONDSVILLE, MA) / September 30, 2017
            2012 Dodge Ram
            Yes
            No

            Roaring sound

            Bought and installed these original 40 series mufflers on my 2001 monte carlo. It makes a great roaring sound that's controlled as per the throttle response. I can take off with easy acceleration and it makes a noticeable sound (roar) I slam the pedal to the metal and it gets much louder which is exactly the type of sound how and when I wanted. No interior drone. So this was done on my stock everything v6 3.8L engine. Now i can imagine the sound from these mufflers onna v8
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            Posted By Osman T (Detroit, MI) / May 23, 2017
            2001 Chevy Monte Carlo
            Yes
            No

            Excellent quality

            Sounds great on my Tahoe. Very happy with the purchase
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            Posted By Matt B (GRAND RAPIDS, MI) / May 4, 2017
            2004 Chevy Tahoe
            Yes
            No

            3rd gen 4runner

            Quick and easy, and now my truck sounds like a truck. Love it. Nice growl.
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            Posted By Joshua P (Lakewood, CO) / March 14, 2017
            Yes
            No

            Muscle car sound

            Got muffler in just a few days! The sound is incredible! Really makesy F150 sound like a real truck!
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            Posted By David W (WAUKESHA, WI) / January 27, 2017
            2011 Ford F-150
            Yes
            No

            Sounds amazing

            I was surprised at how good it sounded.
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            Posted By Anthony S (Lafayette, IN) / November 30, 2016
            2012 Dodge Ram
            Yes
            No

            Highly recommended

            Great sound and helluva performance!
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            Posted By Robert G (Gadsden, AL) / September 21, 2016
            2008 Chevy Impala
            Yes
            No

            Damn fine muffler

            I love the sound,performance,power and gas mileage boost. I am extremely happy with my flow master and I recommend it to everyone I encounter. You have an excellent product.
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            Posted By ray n (SANFORD, NC) / July 3, 2016
            2015 Toyota Camry
            Yes
            No

            2015 challenger install

            These made my 2015 challenger sound like a 68 challenger. Aggressive true muscle car sound u couldn't be happier!!!!
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            Posted By dennis m (LAURENCE HARBOR, NJ) / June 3, 2016
            2015 Dodge Challenger
            Yes
            No

            My Original Flows 40

            I think it's too early to tell. Don't believe their at actual sound yet. Need to brake them in some more cause they should sound more pronounced I believe. We'll see .
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            Posted By Raphael S (CALUMET CITY, IL) / October 28, 2015
            2008 Chevy Impala
            Yes
            No

            Great

            Easy buy. Great rumble. Cake for my exhaust guy to install!
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            Posted By Robert S (Davenport, IA) / October 10, 2015
            1973 Chevy Camaro
            Yes
            No

            Really good

            I ordered these to put on my 08 Subaru Impreza and it gave it an amazing sound. I needed new piping to adjust to the size of the inlet and after it was done the sound came put great!
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            Posted By Jordan A (NARRAGANSETT, RI) / September 17, 2015
            2008 Subaru Impreza
            Yes
            No

            Great Muffler

            Everything your looking for when getting a new muffler. Very satissfied.
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            Posted By Rodolfo T (Laredo, TX) / December 22, 2014
            2012 Toyota Tacoma
            Yes
            No

            Awesome sound

            The 40 series has a very aggressive deep sound, I freaking love it! It does have some drone but it's not bad
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            Posted By Christopher B (PLANO, TX) / August 28, 2014
            Yes
            No

            sound awesome

            purchased the fm40's for my 1970 ranchero gt, 351 cleveland, woke it up, with sound and hustle,,,,
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            Posted By Mark C (parma, MI) / August 28, 2014
            Yes
            No

            Flowmaster 40

            Best thing I can say about the Flowmaster is that it was made in the USA. Good product; easy install, affordable, got to me in reasonable amount of time. Thanks
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            Posted By Larry B (Garden City, KS) / March 1, 2014
            1990 Ford F-450/550
            Yes
            No

            Love the Sound

            I have ran Flowmaster Mufflers for years and I love the sound of the Original 40 Series. The sound of the Original 40 Series Mufflers are a very aggressive tough sound that echoes the sound of performance.
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            Posted By LANDON J (Littleton, CO) / February 15, 2014
            2007 Chevy Silverado
            Yes
            No
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