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
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CMI Ropewalker Arborist AL - Premium Climbing Rope for Arborists
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CMI Ropewalker Ascender AL - Efficient Climbing Tool
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CMI Ropewalker Ascender SS - Part Number 434348
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  • Trolley 5.8
    Trolley 5.8
    $306.75
    $306.75
    $306.75
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  • Micro Trolley 5.8
    Micro Trolley 5.8
    $179.10
    $179.10
    $179.10
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  • Cmi E X Pedition Ascender Pair Cmi E X Pedition Ascender Pair
    Cmi E X Pedition Ascender Pair
    $287.00
    $287.00
    $287.00
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  • Ultrascenders Large Blk Pair Ultrascenders Large Blk Pair
    Ultrascenders Large Blk Pair
    $273.55
    $273.55
    $273.55
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  • Double Handed E X Ped Ascender
    Double Handed E X Ped Ascender
    $234.30
    $234.30
    $234.30
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  • 10 Pk Speed Line Kit
    10 Pk Speed Line Kit
    $325.00
    $325.00
    $325.00
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  • 2" Dbl Al Shv Bearing Pulley
    2" Dbl Al Shv Bearing Pulley
    $117.35
    $117.35
    $117.35
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  • Cmi Shembiner X L
    Cmi Shembiner X L
    $50.30
    $50.30
    $50.30
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  • Cmi Swivel Pulley
    Cmi Swivel Pulley
    $119.45
    $119.45
    $119.45
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  • Cmi Swivel Pulley Slic Pin
    Cmi Swivel Pulley Slic Pin
    $122.65
    $122.65
    $122.65
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  • 11" Standard Eye S PO Rt Rack
    11" Standard Eye S PO Rt Rack
    $137.75
    $137.75
    $137.75
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  • Cmi Rescue 8 Black Aluminum
    Cmi Rescue 8 Black Aluminum
    $54.66
    $54.66
    $54.66
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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.