• Universal 4" Optimal Flow diesel muffler in black T409 stainless steel for Duramax, Powerstroke, and EcoDiesel engines.
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Universal 4" Optimal Flow Muffler

Universal 4" Optimal Flow Muffler

$150.00
$150.00
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Shipping calculated at checkout.
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Description

The Universal 4" Optimal Flow Muffler fits any 4" aftermarket straight pipe exhaust system on Powerstroke, Cummins, and Duramax trucks. It's a straight-through, non-directional design built to knock down resonance without choking your flow.

The body is T409 unpolished stainless steel with internal stainless steel mesh and fiberglass, and that straight-through path is what keeps back pressure low while still quieting things down. Both ends run a 4-inch inner diameter on the inlet and outlet. Overall length is 20.25 inches, with a 14-inch body that's 7 inches round.

Because it's non-directional, you can install it in either orientation. To fit it, measure and cut your current exhaust. Welding it in place is recommended, though you can clamp it on instead. Just note that clamps are not included.

It works across all Powerstroke, Cummins, and Duramax models as long as you're running a 4" aftermarket straight pipe setup. Alaska, Hawaii, and some Canadian locations are subject to additional freight charges, which show at checkout based on your address.

The Universal 4" Optimal Flow Muffler fits any 4" aftermarket straight pipe exhaust system on Powerstroke, Cummins, and Duramax trucks. It's a straight-through, non-directional design built to knock down resonance without choking your flow.

The body is T409 unpolished stainless steel with internal stainless steel mesh and fiberglass, and that straight-through path is what keeps back pressure low while still quieting things down. Both ends run a 4-inch inner diameter on the inlet and outlet. Overall length is 20.25 inches, with a 14-inch body that's 7 inches round.

Because it's non-directional, you can install it in either orientation. To fit it, measure and cut your current exhaust. Welding it in place is recommended, though you can clamp it on instead. Just note that clamps are not included.

It works across all Powerstroke, Cummins, and Duramax models as long as you're running a 4" aftermarket straight pipe setup. Alaska, Hawaii, and some Canadian locations are subject to additional freight charges, which show at checkout based on your address.

  • 5 stars: 16 (89%)
  • 4 stars: 0 (0%)
  • 3 stars: 1 (6%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (6%)
C
Chad Joiner
4” Optimal Flow Muffler

All the reviews were correct. The muffler is awesome. It idles as factory now without the spewing sound. Still has the deep tone. Would definitely buy again. Also, I had to call the diesel dudes for questions and they were very helpful.

Chad Joiner review photo
B
BILL RUTH
A must have when doing a delete

The muffler really quieted down the deleted system. I can carry on a normal conversation now and not have to listen to the deafening drone of a fully deleted system.

D
Damien

Works amazing. Cut noise in half. Super happy

M
Mike
4” muffler

Installed the 4” muffler after deleting the truck without the muffler and was a little too loud towing and had a bit of a drone while cruising. The muffler solved everything. Thank you!

L
Louis Pick
Works Great

Does a great job taking the edge off of you think the straight pipe is too loud. Installed easily and gives it a lower powerful growl.

J
Jeff Allen
Universal 4 optimal flow muffler

Seems to be a good quality muffler.
Truck has a good sound and not super
Loud.

C
CHRISTOPHER PAYNE

Universal 4" Optimal Flow Muffler

B
Barry Sims
Muffler

Works exactly as advertised!

R
Ryan Batie
Good quality but no hangers

The muffler seems to be built very well and i’m sure it will work great but I am going to have to weld some hangers on it to hold it up.

A
Anthony Woods
successful install.

Muffler works as advertised and quieted it down just a bit after a full delete which is what I was looking for, without the muffler the truck was too loud and I'm not 17 any more. Install was easy.

J
Jimmy Dunn
Optimal flow muffler

Muffler took all the drone and roar out of cab due to the straight pipe truck still has a real good sound but I am able to concentrate and talk while I drive. Overall, this is a good muffler for the money.

B
BENNETT HARBAUGH
first time delete

muffler fit good thanks

E
Edwin Diaz
It’s factory sound

If you have a F-250 2022 deleted 4 inch straight pipe and replaced that one section before the rear with this muffler, it will sound like factory again, with no drone affect at highway speeds .

R
Rick Seeber

Truck runs great, partsarrived and service ws good

R
Randall Bowmaster
2015 Denali Crew Cab Diesel

Muffler is compact and flows nice.
No drone in the cab at hi way speed.
Has a nice deep tone.

B
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

D
Dillon Gibbs
Muffler

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

M
Martin Flynn
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.

L
Lee

Would this help tone down the turbo whine on my 5.0 liter deleted Nissan?

thedieseldudes

It can help tone down drone heard in the cabin and overall make the noise from the exhaust system more dampened/quieter

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