Speaking of yesterday, I was on the M4 home when the rain really started coming down. I was between junctions and nothing I could do, was aquaplaning all over the place due to the paradas and really worried about the AEM CAI.
There was just so much water on the road coupled with the spray, the car started hesitating like it was going to stall and revs wandered. I managed to get it to a service station which was conveniently close, and switched the engine off. Stuck my hand down the hole behind the headlight and sure enough the filter was wet. Even through the hydro sock.
I knew I wasn't going to be driving for a while so popped on an extra jumper and went to sleep, woke up an hour later with it still raining but looking brighter. 30 minutes later the rain had stopped. Checked the filter again and the hydro sock was dry, and the filter was only wet near the plastic base.
Jumped in the car and drove home, never again. They are not worth the hassle. Didn't even try an vtec that night, but had an instance when it snowed where if wouldn't work. Been out in the car this morning and all is fine, I was very lucky.