Type A2 The Original! : The BOA decoupling joint type A2 was the worlds first self-supporting exhaust system decoupling joint. It continues in production today with over five million units having been put into service.

Properties include:
• Low cost decoupling joint for dual exhaust down-pipe system
• Acceptance of angular motion 
• Good decoupling of engine vibration
• Combined flange allows vertical assembly onto engine manifold

Type A1: Identical in properties to the A2, the A1 decoupling joint is intended for use in single down-pipe systems.

Type SE: The SE is a low cost decoupling joint that uses a circumferentially mounted stainless steel cable as the load support mechanism in place of the wire mesh element used in other designs.

Properties include:
• Acceptance of angular motion
• Very good decoupling of engine vibration
• Compact and a rotationally symmetric design
• Vertical mounting orientation
• Can be flange mounted

Type CE: A cost reduced version of the earlier C type decoupler, the CE has proven its durability in several million vehicle applications.

Properties include:
• Acceptance of angular motion
• Very good decoupling of engine vibration
• Compact and rotationally symmetric design
• Vertical or horizontal mounting orientation
• Can be flange mounted