Im not to sure about the Hi revs thing, i had a DC2 VTiR which had a CAI and when i would accellerate it hard in the rain it would suck up water and turn off.
Luckily it was still good after that, i just learnt to never to put load on the accellerator when driving through rain and never had any problems after that. I dont know about revving the shit out of the motor which will cause you to just spin in the rain, the air intake sucking the most water? Water expell through the exhaust? and risk sucking all that water into the head?