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Custom Marine Exhausts

Naturally Aspirated:

Exhausts up to 750hp

Super Charged:

Exhausts up to 750hp

Naturally Aspirated:

Exhausts over 750hp

Super Charged:

Exhausts over 750hp

Custom Marine exhaust systems are designed to deliver the highest level of on-the-water performance for professional marine operators. Generating the most power possible from a marine engine is a challenge every designer and marine engineer faces. All CMI high-performance exhaust systems feature headers, big tail pipes and free-flowing mufflers to eliminate back-pressure in the exhaust system.

Many boat operators with high performance requirements pursue extra power through aftermarket add-ons including intakes, carburettors, ignitions, water pumps, and valve covers. This does not overcome the design constraints of stock, cast-iron manifolds which create internal air resistance making it difficult for exhaust gas to flow freely as it exits a cylinder which robs the engine of horsepower. Small exhaust pipes cause back pressure which has the same effect.

The easiest way to increase horsepower is to allow exhaust gases to freely exit the engine by installing Custom Marine tubular-style headers. These headers are designed to improve an engine’s ability to breathe freer and generate more power than stock, cast-iron exhaust manifolds. Dynamometer testing has proven that ‘hot’ cylinders are a common cause of premature engine failure, especially in high performance marine applications.

The design of Custom Marine header systems improves scavenging of each cylinder to remove exhaust gases that produce potentially damaging high cylinder head temperatures. CMI headers are made from high-quality 316L and 317L stainless steel tubes that are heat treated (annealed) for added stress relief and superior durability. CMI technicians specialise in top quality hand-welded and hand-polished marine exhaust systems.

Custom Marine high performance exhaust clients include:-

Mercury Racing, Cigarette Racing Team, Donzi Marine, Fountain Powerboats, Ilmor Marine Engines, MTI Powerboats, Nor-Tech Powerboats, Outerlimits Powerboats

Contact Details:-

Custom Marine - 1315 County Road G, Neenah, Wisconsin 54956 USA TEL +1 920 720 4225

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