Mark,

The MFG's intended purpose is to minimize the visual effect of the exhaust trail by passing the exhaust thru a an exit consisting of approximately 25 small holes vs the traditional single hole.. This works to some degree. The welcome side benefits are placing the exhaust exit further from the air frame in cleaner air flow resulting in less swirling especially during rolls. In addition the diffuser reduces exhaust exit noise by at least 1 DB.

Sorry I have no close up photo at this time.