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About CMI


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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Custom Marine Inc. – Featured Products

Career Opportunities at Custom Marine

Career Opportunities:

Welders / Fabricators, Press Brake Operators, CNC Machinists, CNC Programmers, Laser Operators, Polishers, General Laborers

Custom Marine - 520 Upgrade package

520 upgrade package

Horsepower gains from 31hp to 48hp!
View 520 Dyno data!

Custom Marine - LS E-Top Headers

LS E-Top Headers

New LS E-Top Small Block headers for superior exhaust performance

Custom Marine - Gen-X Headers

Gen-X® Headers

Direct factory replacements for Mercury HP525EFI, HP600SCi and HP700SCi engines

Why CMI?

Every CMI header is built to exacting standards that have made them the number one choice for offshore racers and performance-oriented boaters who demand on-water performance.

CMI headers are manufactured using state-of-the-art materials, like 316L and 317L stainless steel, offering superior corrosion resistance and durability. A unique, patented bending process assures uniform wall thickness and eliminates any rippling and crazing of the tubing during production. Semi-automated tungsten inert gas welding, plus heat treating of the complete manifold following assembly, significantly reduces internal stresses that commonly cause fatigue, corrosion and premature failure in most high performance applications.

To complement its header systems, CMI also manufactures custom tailpipes, exhaust accessories and integral mufflers for virtually any single, dual, triple or quad engine configuration, including small block or big block applications, Chevrolet and Buick V-6s and Ford 460 and SVO's.

With CMI, boaters get a combination of performance and reliability unparalleled by any competitive products on the market.

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

It's all about Performance