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Universal 4" Optimal Flow Muffler

Universal 4" Optimal Flow Muffler

Regular price $150.00 USD
Regular price Sale price $150.00 USD
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 Feature 4 Inch
Material T409 Unpolished
Stainless Steel
Inlet Size
4-inch inner diameter
Outlet Size
4-inch inner diameter
Overall Length
20.25 Inches
Body Length
14 inches
Body Size
7-inch round

Vehicle Fitment

Our mufflers fit all Powerstroke, Cummins and Duramax models available on our website. This will fit any 4" aftermarket straight pipe exhaust system. 


You will have to measure and cut your current exhaust for this to fit. We recommend welding the muffler in place. However, you can also clamp them on. Clamps are NOT included. 

Product Features

  • Straight-through flow path for maximum performance
  • Non-directional design, allowing you to install the muffler in however way suites your truck and exhaust system best.
  • Stainless steel construction for lifelong protection (unpolished)
  • Internal stainless steel mesh & fiberglass construction to withstand harsh conditions and advanced technology to absorb unwanted interior resonance.
  • Straight-through design to reduce back pressure and enhance performance 

* Note: Alaska, Hawaii and some Canadian locations will be subject to additional freight charges

Customer Reviews

Based on 3 reviews
Brian Wright
Wrong item delivered

I can't give a good review. I am still waiting on the support team to solve the "wrong items delivered again" problem.

Hey Brian,

Sorry to hear that! That's on us, we'll send you a new muffler with express shipping, check your email for the new tracking number

Dillon Gibbs

Works great! About the same sound as factory. Fit was excellent for the pipes.

Excellent Product

Quality muffler with perfect fit & finish. When driving casually, the sound of the exhaust note is deeper than stock and not loud. When you really get on it, the sound is impressive.