It seems that the vast majority of owners do exactly what your boss has done. Turning down the exhaust outlets under the car, forward of the bumper is the most logical solution.
There are only two reasons for having the exhaust exit through the bumper or guards; (1) the car is shown in high quality "points scoring" shows, and/or (2) the owner is an incurable authenticity nut. The combustion deposits are only a cosmetic problem for the first 10 miles of operation in temperatures below 70-80 degrees. Wiping the exhaust port area after driving using Windex and a paper towel before parking the car overnight will prevent any plating deterioration. Actually, you can go for many days and a couple thousand miles without cleaning or ruining the chrome.
Each year we have about 50 + small Birds get together for a week-end outing. The cars MUST be driven to this event. I estimate less than 10% of the cars have their exhaust routed through the bumper. Most folks just don't fight it anymore. It was just another styling gimmick from the era that proved to be impractical; much like headlights on current cars that cloud over after a few years.
Tom
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