Yeah, water will get in the engine bay as it will when it rains. I used to have one. I carried a roll of duct tape with me and placed a strip under each vent opening (perfect size) and tore it to fit length wise. Mine was clear coated on the underside as well which made it easy. I know this may sound silly to some but it works.
ESS CFR500 ///M3
420 RWHP, 316 RWTQ