CMI

Performance marine exhaust, built to run

CMI

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Upgrade your exhaust with confidence

From replacement gaskets to stainless components, CMI parts help keep your boat running clean and strong. Get fast shipping and support from Lotz Outdoors.

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CMI Kids Seat Harness - Secure and Comfortable Safety Solution
CMI Kids Seat Harness - Secure and Comfortable Safety Solution
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CMI Ropewalker Arborist AL - Premium Climbing Rope for Arborists
CMI Ropewalker Arborist AL - Premium Climbing Rope for Arborists
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CMI Ropewalker Ascender AL - Efficient Climbing Tool
CMI Ropewalker Ascender AL - Efficient Climbing Tool
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CMI Ropewalker Ascender SS - Part Number 434348
CMI Ropewalker Ascender SS - Part Number 434348
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  • CMI Adjustable Rigging Chain 42" for Heavy-Duty Lifting and Rigging
    CMI Adjustable Rigging Chain 42" for Heavy-Duty Lifting and Rigging
    $35.90
    $35.90
    $35.90
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  • CMI Figure 8 PO Lished - Heavy-Duty Industrial Cable Management Solution
    CMI Figure 8 PO Lished - Heavy-Duty Industrial Cable Management Solution
    $29.70
    $29.70
    $29.70
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  • CMI 2 3/8-inch Aluminum Shv Bearing - Model 435430
    CMI 2 3/8-inch Aluminum Shv Bearing - Model 435430
    $93.45
    $98.15
    $93.45
    Add to cart
  • CMI 2 3/8 Inch Stainless Steel Shaft with Double End for Heavy-Duty Applications
    CMI 2 3/8 Inch Stainless Steel Shaft with Double End for Heavy-Duty Applications
    $114.95
    $120.70
    $114.95
    Add to cart
  • CMI Service Line Micro Pulley - Model 435500
    CMI Service Line Micro Pulley - Model 435500
    $26.25
    $26.25
    $26.25
    Add to cart
  • CMI 2-inch Prusik SS Bushing - Heavy-Duty Rope Bushing for Secure Attachments
    CMI 2-inch Prusik SS Bushing - Heavy-Duty Rope Bushing for Secure Attachments
    $94.95
    $94.95
    $94.95
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  • CMI 2-Inch Prusik with Stainless Steel Double Bushing
    CMI 2-Inch Prusik with Stainless Steel Double Bushing
    $147.75
    $155.15
    $147.75
    Add to cart
  • CMI 2 3/8 Inch Aluminum Sides Bearing Pulley
    CMI 2 3/8 Inch Aluminum Sides Bearing Pulley
    $99.00
    $103.95
    $99.00
    Add to cart
  • CMI 2 3/8 Inch Aluminum Sides Bushing Pulley
    CMI 2 3/8 Inch Aluminum Sides Bushing Pulley
    $78.70
    $82.65
    $78.70
    Add to cart
  • CMI Heavy Duty 4-inch Pulley
    CMI Heavy Duty 4-inch Pulley
    $132.30
    $132.30
    $132.30
    Add to cart
  • CMI Rope Washer 5/8 Inch - Heavy-Duty Marine Rope Accessory
    CMI Rope Washer 5/8 Inch - Heavy-Duty Marine Rope Accessory
    $64.79
    $67.40
    $64.79
    Add to cart
  • CMI 2 3/8 inch Aluminum Plate Steel Shield Double - Durable and Corrosion-Resistant
    CMI 2 3/8 inch Aluminum Plate Steel Shield Double - Durable and Corrosion-Resistant
    $79.30
    $83.30
    $79.30
    Add to cart

About CMI

Custom Marine Inc., known as CMI, is a marine performance manufacturer recognized for stainless steel exhaust systems and components built for serious power and long days on the water. CMI works with engine builders, OEM boat manufacturers, and distributors who rely on consistent quality and race-proven results.

From headers and tailpipe components to gaskets, hardware, and the small parts that keep a system sealed and running right, CMI parts are designed for real-world service and dependable installation. If you are refreshing a setup or keeping a boat ready for the next season, these components help you maintain performance without guesswork.

At Lotz Outdoors we stock CMI parts for boaters and technicians who want durable stainless components, quick shipping, and support from a team that understands marine rigging and maintenance.

Warranty

Standard Elbow Top headers are warranted for two years from date of manufacture, all other headers and exhaust components are warranted for one year, defects in materials and workmanship to the original buyer.

View warranty details

CMI Customer Service

920-722-7084

For product-specific support, warranty claims, and technical questions, contact the brand directly.

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CMI FAQs

What is CMI known for?

CMI, Custom Marine Inc., is known for high-performance stainless steel marine exhaust systems and the components that support them, including header and tailpipe parts, hardware, and replacement pieces built for demanding on-water use.

Where are CMI products made?

CMI manufactures marine exhaust products in the United States, supporting OEM builders and performance boaters with American-made stainless components.

Does CMI offer a warranty?

Yes. CMI provides a limited warranty that covers defects in materials and workmanship for the original buyer. Standard Elbow Top headers are warranted for two years from the date of manufacture, and most other headers and exhaust components are warranted for one year.

What makes CMI exhaust components different?

CMI parts are built around fitment, durability, and consistent performance. Stainless construction and proven designs help reduce guesswork during installation and keep systems running reliably in harsh marine conditions.

What types of products does CMI make?

CMI makes marine exhaust headers and related exhaust components, plus supporting parts like gaskets, clamps, fittings, and hardware used to build, service, or refresh performance marine exhaust systems.