It's All About Performance
Custom Marine Inc.

1315 County Road G

Neenah, WI 54956


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Year Established 1984

Stainless Exhaust Specialists


At CMI, we work with the most respected marine engine manufacturers, OEM boat builders & distributors in the world who place their trust in CMI to ensure their products deliver the performance their customers demand.
Our industry-leading technologies & race-proven products have earned us a place in the winners circle on race circuits worldwide. But it’s our reputation for delivering high-quality performance products that has earned long-term relationships with our customers.
For more than 2 decades, Custom Marine stainless steel exhaust systems have been skillfully-built to exacting standards, which have made them the #1 choice for offshore racers & performance-oriented boaters who demand superior on-water performance. CMI offers, Big Tube Headers, Big Elbow Top Headers, Sport Tube Headers, Gen-X Headers, Tailpipes, Mufflers, Transom Tips, Sea Strainers, Trim Rings & more.

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