My experience is that cars in drier areas aren't affected much, other than the help the pan gives with airflow and such. However Eastern cars are definitely affected. I find a higher failure rate on AC compressors and alternators as well as their mounts and mounting hardware.
Most important, and I don't know if this applies to 7 series but it does to 2-series: The steering shaft universal joints are much more subject to corrosion from road salt and moisture and fail sooner without the pan.
One more thing, it protects the hot air tube.
Keep that splash pan in place.
DS
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