New CMI Headers for Mercury Racing 520 | Boating Magazine

New CMI Headers for Mercury Racing 520

Custom Marine headers boost horsepower and improve mid-range acceleration and torque.

CMI says its 520 Sport Tube headers increase power by up to 48 hp.

Custom Marine

CMI says its 520 E-Top headers increase power by up to 31 hp.

Custom Marine

Custom Marine has introduced header packages for the Mercury Racing 520 stern drive. CMI 520 Sport Tubes reportedly increase output by up to 48 horsepower and improve mid-range acceleration and torque. The special downturn collector improves water fill and water flow through the system and the headers have a patented Cool Collar design. The pipes are mandrel bent and formed from 316L stainless steel and come in a polished finish.

CMI says its 520 E-Top Headers increase output by up to 31 horsepower and boosts mid-range torque and acceleration. They are a direct replacement that work with existing transom outlets. The 520 E-Top headers have the patented Cool Collar design and are mandrel bent and formed from 316L stainless steel. They are available in polished and satin finish.

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