[radz28]

GM wouldn't have added the time of development and expense of a part if they didn't think it was necessary. I won't pretend to suggest they spent millions on engineering on a part that costs like $5 to produce, but if, for example, they (and every other manufacturer) skimp on not painting what they don't need to (just look under the hood or chassis for the OEM e-coat where there is neither base coat or clearcoat) to save however much that is on materials, they won't add a part unless it is necessary. I recall reading a part of the book about the 6th Gen where they added a brace to the chassis only on V8 cars (because they needed the extra strength) around the rear torque box. That's one of a couple examples I can argue.

If that part didn't need to be there, they wouldn't add it. I removed mine because I have no intent on driving much in the rain. I would be willing to bet, though, that unless you were under heavy throttle much (and I'm not sure how one could be with this car in the rain), you likely don't have much to worry about. I only have theories though...