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Your cart is empty.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.
Corey Stiles
2025-08-22 19:25:53
Sounds sounds awesome. I Would recommend buying or I would buy it if I needed it
Bill H.
2025-08-16 15:38:51
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
Tom
2025-07-11 14:28:52
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.
Kyle
2025-06-20 12:40:50
This is a classic and iconic go-to muffler for all truck owners looking to convert to dual tailpipes and get that sweet, deep rumble. I put this on my father’s 2004 Silverado 5.3L after I removed the catalytic converters and it really roars like an old school truck. Sounds great at start-up, idle, and cruising. Wide open throttle isn’t as loud as other truck brands but I believe is specific to the Chevy LS engines. All in all, this is a great muffler and was a good purchase. I would recommend finding the stainless steel version to prolong the life of the muffler.
CeeW.717
2025-06-17 10:04:07
Nice rumble on a cold start kind of quiet on a 09 f150 after warm because of cat and resonators.Nice flo sound good buy.
DANIEL PISAREK
2025-05-26 15:35:09
After over 10 years of flawless service, I guess everything has to come to an end. I had this installed shortly after purchasing my Silverado in 2000 and spliting my exhaust. It has lasted way beyond expectations and two sets of pipes. This is exactly what a Quality piece of American Made equipment should represent to the consumer. Recently I had an unchacteristic back fire and blew the complete dual end off the muffler. I had to smile at the length of hard service and had no issues replacing it. I was very suprised that even after all these years, it was only a few dollars more than the origional purchase price. If anyone wants " what ya Pay for " FlowMaster is the only way to go
Larry Beyl Jr
2025-05-05 16:34:27
Love it great sound just what I wanted
keith w.
2025-04-25 15:38:49
Welded it up to my 2014 dodge ram sounds great less then an hour install very happy great buy being an open box item no complaints
Tim
2025-03-10 09:43:08
I have a 2017 Ram 1500 with 5.7 Hemi with factory dual exhaust. I ordered this muffler on a Monday, was expected to be a week before delivered. I was stoked to see it was delivered by Friday afternoon before I got home the same week. I did leave the resonators on so all I did was had muffler swapped. Only thing you can hear a little now and then is when it kicks MDS in. It's a small trade off for that nice growl and rumble out the back.Had it installed this past Friday at a local shop where they had to make a couple custom pipes so it would fit properly because the factory muffler is 2x the length.This muffler makes that Hemi sing 😠a good tone at idle and start up and let's me know it's there when I'm getting up to highway speeds.Overall very impressed with delivery of this item from the seller and the performance and sound my truck puts out with this muffler.I will definitely buy again in future if needed.
Gary
2025-03-07 10:41:26
Easy install on a 19 ram hemi and sounds incredible.
Daniel A. DeGlopper
2025-03-03 14:42:03
Awesome fit even better sound, nice low growl but not annoying at highway speeds. Flowmaster nailed it with this one !!!
Cal F
2025-02-09 13:09:11
Like always, Flowmaster makes a great product. Very happy with the sound and lil extra ooompf from their exhaust systems.
Abe
2025-02-02 15:45:32
Good product and very accurate discrimination A+++
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