What's harder - completely hydrolocking an engine WITHOUT a CAI. I knew a guy in a '92 Celica GT that did this... the moron was delivering pizzas at night on this back round out in the country, he drove at 60 mph right into a portion of the road which had been flooded in like two or three feet of water by a local creek. The engine completed siezed, and the car still sits in his front yard, waiting for an engine transplant that will probably never arrive...