CMI Header Applications

• Why Choose CMI Header Applications?
• Which CMI Header System is Right for You?
• Build a CMI Exhaust System for Your Boat
• Header Accessories
• Ordering
• Download Catalog

Available Systems

• CMI Big Tube Systems
• CMI Big Elbow Top Race Systems
• CMI Elbow Top Systems
• CMI Sport Tubes Systems
• CMI 496 Sport Tube™ Performance Package

CMI INDUSTRIAL MUFFLERS

CMI Elbow Top™ (E-Top) Systems

CMI Elbow Top headers are designed for direct replacement of most stock cast manifolds. Top engine builders and stern drive manufacturers who want to optimize performance of small- or big-block marinized engines prefer CMI Elbow Top headers for their engines. CMI E-Top systems offer separated exhaust passages with long individual exhaust tube runners to minimize cylinder to cylinder influence and improve exhaust gas scavenging, which allows the engine to breathe freely and deliver peak performance power. Each header features a permanently attached, non-adjustable exhaust tailpipe configured to meet precise specifications for stan¬dard transom layouts and placement of thru-hull exhaust tips. All CMI Elbow Top Systems include rubber water distribution tubes, cooling water bypass couplings installed on the collector elbow, by-pass hose fittings, attaching cap screws, exhaust port gaskets, hose clamps and cooling water inlet fittings needed for most installations. Any Elbow Top System may be purchased with a stainless steel distribution tube upgrade.

CMI Standard Elbow Top Systems

CMI Standard Elbow Top Systems are can be ordered with a range of exhaust tailpipes or CMI’s Sound Choice™ selectable silencing system, which are sold separately.

 

 

CMI Custom Elbow Top Systems

For performance engine applications requiring a true custom fit, the CMI Custom Elbow Top System can be configured to meet the requirements of most engine installations.

 

 

CMI Unit Elbow Top Systems – Unitop

CMI Unitop Systems feature polished elbow collector and attached tailpipes with satin finished primary tubes. Tailpipes are not required for Unitop Systems.