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Someone correct me if I'm wrong, but I believe the school of thought is as follows:
- the underside of a vehicle without a tray is a big source of drag.
- a simpler step than building a full undertray is to build an airdam and side skirts, essentially limiting the air going under the vehicle in the hopes of minimizing the drag. But creating a front airdam increases your frontal area increasing air resistance. It can also create downforce, which hurts fuel efficiency as well. Its a tradeoff and better than nothing.
- Building a full undertray is the better, though more difficult option as it minimizes underbody drag while making the smallest increase to frontal area possible.
If you already have a full undertray, adding a significant airdam and side skirts would probably be more detrimental than helpful.
hth
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