TOTALFLOW 647 Universal Race Exhaust Muffler - 4 Inch ID | 4 Inch OD

Manufacturer: TOTALFLOW
SKU: 647
UPC: 816264026218

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 - Reversible4" ID | 4" OD
Body Size | Shape5" 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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To be expected.
Works great on my 2002 Cummins. Bought a 4” for it just so it could be considered legal. Slight(very very slight) reduction in noise and no tone difference, but was to be expected. Would recommend this product. However, I did receive mine with one slip-on end and one weld-on end which was disheartening. Never the less, I made it work.
| 1/19/2020
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Awesome for state inspection
This product is great if your looking to pass inspection for having a muffler but yet still have a loud exhaust. I put it in a 2005 lly duramax and I didn’t notice any difference over straight pipe. Would buy again
| 12/14/2019
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Pipe slides in the one side but not the other
Nice product for the money
| 12/14/2019
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As advertised
Good quality for the price point. Would use again for a budget project
| 12/10/2019
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Great product
Nice product. Work great
| 10/9/2019
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wrong size
wrong size
| 9/24/2019
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Great quality for the price.
The muffler is small and fits in tight spaces. It also provides a great deep sound to the exhaust.
| 8/18/2019
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