No Plastic bag? COLD AIR INTAKE = CAI! you definatly dont want water getting in there! that will mean water straight into the valves&cylinders depending on how much water of course! No plastic bag,, your not spraying that much liquid into the engine bay hence even if a small amount makes it to your filter on the CAI its not going to make it up the piping... only note is if you have an aftermarket alarm i believe you will need to bag that and also if you have coilover you need to ensure not to get fluid down the top mounts.. ic...Thanks :) But what's the CAI you guys talk about all the time? Just talked to a mechanic yesterday, he said it's not a good idea to spray water into the engine bay, the result can be unpredictable....but make sure wrap up the "alternator"???? :)