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CMI INDUSTRIAL

CMI Industrial is proud of its heritage as a designer and manufacturer of top-quality sound and noise attenuation systems that have set the benchmark for quality and innovation. CMI has enjoyed a decades-long leadership position by offering unparalleled products and services, and maintaining industry-leading customer satisfaction.

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CMI Silencers and Mufflers

Elbow Top Application
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CMI offers a complete line of silencers and mufflers to fit most high performance exhaust system applications.  All CMI exhaust attenuation systems are built using 300 series stainless steel and are fully polished to a mirror finish.  SPECIAL NOTE: Some exhaust attenuation equipment may not be authorized for use in your area.  Please consult local and regional ordinances prior to purchasing any model.

 

CMI XTS™ Exhaust Tip Silencers - NEW!

CMI XTS Exhaust Tip Silencers
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  • Engineered to reduce sound without creating unwanted backpressure
  • 316L Polished Stainless Steel
  • Smoother tone in all speed ranges
  • Available in “Tip-style” or “Clamp-on”
  • Water acts as a noise deadening medium
  • Fully Passivated to minimize ugly rust streaks on the transom

CMI Sound Elimination Systems™

CMI Sound Elimination Systems™


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CMI Sound Elimination Systems mufflers offer proven sound reduction technology that enables boaters to operate their performance boats in areas where sound emissions are restricted. This system should reduce sound emissions to levels as low as 85 decibels (dB) in many applications, which is below most sound emission regulations. The mufflers are engineered to reduce sound without restricting the exhaust or creating unwanted backpressure, which can inhibit the engine from reaching peak performance power. Mufflers can be installed on any exhaust system with tailpipes ranging from four to six-inches in diameter, which covers the full range of inboard or stern drive-powered recreational and performance boat applications up to 1200 horsepower. CMI Sound Elimination Systems mufflers are made from 304 series stainless steel, and have fewer moving parts than competitive models to ensure long-lasting durability and reliability for nearly any application.

Clamp-on options include a 4” model to fit tip-style tailpipes ; a 4.5 inch model to fit thru-transom tailpipes; and a 5-inch model for larger tailpipe diameters primarily used with CMI Big Tube Racine Header Systems.

The 5-inch muffler can also be retro-fitted into 5 and 6-inch outside diameter tailpipes to accommodate larger horsepower applications. This option is also available to OEM boat builders who order mufflers installed during the tailpipe manufacturing process for an inconspicuous appearance on the transom.

Best pricing and availability through one of our
CMI Distributors or CMI Authorized Dealers...click here for details.

Part Part Number
Clamp-On 4 - 5" 39110
Thru-Transom Mount 4 - 6" 39111
Clamp-On 4.5 - 5" 39112
Clamp-On 4.5 - 6" 39113
Clamp-On 5 - 6" 39114

CMI Header and Tailpipe Accessories

496 DIVERTER / "Y" PIPE

496 DIVERTER / "Y" PIPE
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CMI Diverter Y-Pipes conveniently allow the operator to switch from straight exhaust pipes to the original thru-prop exhaust system when quieter operation is required. CMI Y-pipes with coned ends make hose assembly easy on all 496 engine applications equipped with factory riser systems, transom tips, Mercruiser Bravo-style drives and a bullhorn. The Y-pipe design also allows users to add a free breathing exhaust tip to the assembly. CMI recommends installation of baffled tips for most applications.

 

Best pricing and availability through one of our
CMI Distributors or CMI Authorized Dealers...click here for details.

Part Part Number
496 Diverter With Pneumatic Cylinder Activation 39285
Y-Pipe Without Diverter 39305

 

CMI Internal Sound Choice System™

All CMI Sound Choice Tailpipes are water jacketed to minimize water reversion.

Best pricing and availability through one of our
CMI Distributors or CMI Authorized Dealers...click here for details.

Part Part Number
Sound Choice Tailpipe Set
For Elbow Top System
Bravo and Alpha-type drives
39900
Sound Choice Tailpipe Set
For Mercury Racing 525 EFI/600 SC
39896
Additional Charge Restrictors  
Sound Choice Tailpipe Set
For Sport Tube Systems
39893

For TRS drives contact CMI dealer/distributor for muffler-only pricing for these items.

 

CMI External Sound Choice System

CMI External Sound Choice System
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CMI External Sound Choice silencers allow the operator to muffle high decibel sound waves emitted through the exhaust with simply a flip of a switch. External Sound Choice stainless steel silencers feature a fully-polished, mirror-like finish and can be installed on most gas or diesel engine applications. Heavy duty shaft and butterfly valves are standard to meet requirements of high-horsepower propulsion systems. CMI Sound Choice System are pneumatically operated, eliminating the risk of electrical spark hazards.

Best pricing and availability through one of our
CMI Distributors or CMI Authorized Dealers...click here for details.

Part Part Number
Aft Firing Sound Choice Silencer
Fits 4-inch O.D. tailpipes & transom exhaust tips
13365
Aft Firing Sound Choice Silencer
Fits 4 1/2" O.D. tailpipes & transom exhaust tips
13305
Aft Firing Sound Choice Silencer
Fits 5" O.D. tailpipes & transom exhaust tips
13740

 

Sound Choice Activation Pneumatic Pump and Accessories

Best pricing and availability through one of our
CMI Distributors or CMI Authorized Dealers...click here for details.

Part Part Number
Solenoid Valve 50290
Pump Only
Without switch
13015
Pneumatic Nylon Tubing with T-Fitting Kit
Adds one Sound Choice set
41280
Pneumatic Nylon Tubing With Connector Union Fitting Kit
Extends pump air line 15 ft.
41140
Pneumatic Activation Cylinder with Air Line Fittings
Aft Fire
41030
Pump Kit, With Switch
Pneumatic activation with line and fitting kit for installing one Sound Choice set
13275
Pneumatic Activation Cylinder
Internal Sound Choice
41310
Pneumatic Nylon Tubing 50450
Pneumatic Line Fitting
Includes 90-degree brass for activation cylinder, line sealing nuts
19110
Pneumatic Line-joining 3-way T-fitting brass
Includes line sealing nuts
54670
Line Sealing Nut with Plastic Guide Sleeve 38130
Internal Sound System Rebuild Kit - Port Side
Kit includes parts & hardware to rebuild Internal Sound Choice silencer. Pneumatic cylinder not included.
41380
Internal Sound System Rebuild Kit - Starboard Side
Kit includes parts & hardware to rebuild Internal Sound Choice silencer. Pneumatic cylinder not included.
41390
Clevis for Pneumatic Cylinder
Aft Fire
50130
Clevis for Pneumatic Cylinder
Internal Sound Choice System
38610
496 Rebuild Kit - Starboard Side 41380
496 Rebuild Kit - Port Side 41390