Yeah its obvious that it will be a prbelm when the stock tmic is moved as it stops the majority of water getting through. When I fitted my fmic ad it rained heavily water would get into my spark plug chmabers and cause a missfire and starting problems until I covered the scoop with duct tape! I would definately recommend doing something to stop the water getting in, whether it be a reverse scoop a Glanza S bonnet or even duct tape, they'll all do the job!