Two Internal Stack Mufflers For 4" Stack with 4" O.D. base

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Two Internal Stack Mufflers For 4" Stack with 4" O.D. base

NOTE: Questions, Call 715-254-2307

Internal Stack Mufflers From Grand Rock 4" x 18"

Fits Stacks with 4" O.D. Base

Internal Stack Muffler from Grand Rock, aluminized steel straight-through muffler reduces high pitch, harsh tones that can be found in diesel exhaust. Helps reduce cab drone, but small reduction to overall exhaust volume.

Insert stack muffler into the bottom of the stack. The internal muffler has a lip around its bottom which will stay between base of stack and t-pipe outlet when internal muffler is installed. Stack Muffler fits snugly into the base of a stack with a four inch outer diameter base.

2 Internal Stack Mufflers/Baffles

Internal Stack Muffler

  • Aluminized Steel, Straight Through muffler helps reduce harsh exhaust tones.
  • Stack muffler can easily be removed and relaced again
  • Stops that harsh rapping sound leaving the low rumble unaffected
  • Sold Individually

Customer Testimony from R. Schenk :

  • Thank you for carrying a great product and having helpful customer service reps. The internal muffler helped to lessen the in cab drone on my straight cat deleted 95 dodge cummins that I am able to drive down the rode without getting a head ache. The over-all installation on the product was pretty straight forward. The product was nicely constructed as well so I give this product a 5 out of 5 stars. Thank you so much Black Cloud Diesel.
Warranty Information: Chrome-plated (except weld area) and aluminized parts used on heavy duty truck exhaust systems are warranted against defective material and workmanship for a period of 1 year from date of shipment. Call if you have questions on proper installation techniques. Grand Rock and Black Cloud Diesel cannot be held liable for damage done as a result of improper installation. If a part is determined to be defective, Grand Rock and Black Cloud Diesel reserve the right to replate only and return the part when the part has been modified, altered, or otherwise damaged. Neglect is not Warranted! Keep the parts clean & waxed!

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  • 2

    Posted by Josh on 30th Jun 2020

    Took away very little of the 12 Valve drone. To the average ear it didn't have any effect on the exhaust volume. I'd honestly say they only did about 10% of what I thought they'd do. 2 extra layers of Noico 80 sound deadening took away 2x as much drone for half the price. With the combination of these products I'm good.