Does that really help given the huge fresh air intake will let large amounts thru and drains to the same place?Seal the covers with a good load of silicone, the covers bend in the middle so it needs to be a good dollop.
Also put a blob on the threads and heads of the screws that run the length of the scuttle
Do i need to take the inner wings off to see the drain tube? There's nothing obvious at all near the mud flap