TOTALFLOW 644 Universal Race Exhaust Muffler - 2.5 Inch ID | 2.5 Inch OD

Manufacturer: TOTALFLOW
SKU: 644
UPC: 816264026188

Stainless Steel FinishMay Require Welding JobOne (1) Year Limited Warranty

Availability: Out of stock
Products specifications
Material409 Stainless Steel
FitmentUniversal Fitment
Reversible MufflerYes
Reversal Muffler Configuration | Bi-DirectionalCenter | Center
Muffler TypeMini Race Design
Inlet | Outlet Diameter - Reversible2.5" ID | 2.5" OD
Body Size | Shape3.5" Round
Body Length4"
Overall Length6"

TOTALFLOW straight through performance exhaust mufflers constructed with 409 stainless steel, our exhaust mufflers designed to allow for maximum free flow—and horsepower. Whether you have a true dual exhaust system or not, our mufflers will make you master the flow & the sound of your exhaust system giving you the max dyno results. Our bullet race exhaust mufflers, resonators and glasspacks can be used off road & can be a great addition to your on road super custom project. TOTALFLOW mufflers feature a straight through, perforated 409 stainless steel core wrapped with 430 stainless steel mesh acoustic material, making it the ideal mufflers for your next custom exhaust project, allowing for a free flow through the pipe with very little restriction.

  • Made from Heavy Gauge fully welded 409 stainless steel muffler.
  • Free flow muffler, straight through perforated stainless steel core wrapped with stainless steel mesh.
  • Minimal decibel reduction over open headers.
  • Perfect for any custom exhaust project.
  • Compact size - will fit anywhere.

Safety Warning

TOTALFLOW® Recommends the installation of this product at professional facility.

⚠ WARNING: This product may contain chemicals known to the state of California to cause cancer and birth defects or other reproductive harm. For more information please go to

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Very well built.
Very well built and packaged blow through muffler. Really mild and quiet at idle and a really nice deep crisp high note at top end performance. Very pleased with it.
| 3/2/2020
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Great product
Product measured actually as said. Good product. Nice wall thickness. Good quality.
| 2/29/2020
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Sounds perfect!
DEPENDING on your vehicles application (my 2012 5.7 Tundra) I left original cats, Installed an Xpipe and through these on the back. What a difference. Sounds absolutely, no drone for me. And has a very nice see growl all the way through the rpm. I had some longer ones prior somewhere between 8”-10” and still was impressed but slightly quieter. Overall, would definitely buy again!
| 2/18/2020
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Highly recommended
Great product
| 1/26/2020
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Sounds really nice
Small & compact
| 1/15/2020
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fast delivery
very loud
| 1/6/2020
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Sounds good
I put it on a f150 with a v6 sounds good
| 1/4/2020
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Free flow exhaust
If your looking for a exhaust note with a deep tone you get that with this muffler
| 12/15/2019
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low cost, high value
I am very pleased with this purchase. I have a 2012 Infiniti M37 and decided to do a resonator delete. I also installed Magna flow mufflers in place of the OEM. The result was terrible drone at highway driving. After reading reviews, I decided to give these mini resonators a try. I was skeptical that being so small, how could they make a difference. I also installed an X-pipe and these were mounted right after the x pipe. Wow, what a difference they made. They got rid of that awful drone without effecting the exhaust tone. I am very glad I decided to go with them.
| 11/20/2019
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Great product. Fast shipping
Great looking product. Great welds. Very small. Fits in tight places.
| 10/8/2019
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Let the Hemi roar!
Arrived in 2 days. These will be perfect on my 05 Dodge Magnum RT. Cheaper than the options on summit and jegs. Def a good purchase
| 10/7/2019
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Little muffler with a big punch.
Size, coming straight of the headers there is hardly any difference in the size of the headers and mufflers. Less to drag or bend. And the sound is beefy, it may be a little loud
| 10/4/2019
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Sounds like a race car
Great product
| 9/11/2019
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Solid built, high quality part.
These provided a good solution in removing drone from my exhaust.
| 9/2/2019
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Seriously so good.
I took my 2015 Q50 and decided to ditch the dual exhaust all together. Ended up with headers, the down/test pipes from Megan, the Y-Pipe from Megan, and then I had to custom build what I have now. It used to be completely straight pipes with no resonators or cats whatsoever, but the high end rasp killed. The sound was epic, performance was incredibly noticeable, but the god the rasp. So I found this high flow resonator to keep the straight piped sound and performance and minimized the bulk h buying this one. I’m so glad I did too. The Infiniti Q50 sounds incredible now with this TOTALFLOW! So now, there’s 2.5” piping all the way through and instead of dual exhaust exits from the y-pipe, I have one 2.5” exit that drops off right offer my real axle. She’s a real treat to listen to. Hardly noticeable when cruising, but deafening when you step hard. Highly recommend!
| 7/13/2019
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