16 april 2026
108 min
As the founder of Customer Marine, Inc. (CMI), Joe Zelinski stands as a central figure and true innovator in the high-performance marine world. For decades, CMI headers have set the benchmark for performance marine exhaust systems.
Raised by a father who was a plumbing contractor, Zelinski developed a strong work ethic early on, along with a natural curiosity for anything mechanical. While spending summers digging ditches for his father's business, he purchased his first boat, a Boston Whaler, at just 12 years old. Not long after, he landed a job at a local boat shop where he was paid in parts, eventually working his way into pit crew duties for the owner's son on the race circuit. It was there that Zelinski developed a passion for racing and began focusing on building components to go faster.
After graduating college, Zelinski joined Kiekhaefer Aeromarine, taking on a variety of roles within the company. While observing an effort to duplicate an existing set of stainless steel headers, he proposed that the company manufacture its own. The idea was met with resistance, and Fred Kiekhaefer challenged him directly: "If you want to build headers, go start your own company building headers!" Taking that challenge to heart, Zelinski left the company in 1986 and introduced CMI to the industry at the IMTEC show in Chicago in 1989.
In this episode, Zelinski reflects on the path that grew CMI into a dominant name in the marine industry, with its headers becoming standard equipment on Mercury Racing engines and a top choice for leading engine builders such as Sterling, Innovation, and Keith Eickert.
The conversation also traces Zelinski's later years with the company, including the sale in 2005, the transition into corporate ownership, and his eventual departure in 2012.
To learn more about Custom Marine, Inc visit them online @ www.custommarine.com
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