the aem bypass valve is the biggest gimmick i ever heard of. aem is a big fat company that hires marketers in place of engineers. the only way youll get hydrolock is if you drive through standing water atleast 12 inches deep with your engine revving high and your throttle wide open. i have a cai and i drove through 12 inches of water, but what i did was stop, back up, and accelerate to about 40 then just put it in neutral through the water and i coasted out completely unscathed. the worst thing that happens is your engine stalls. i gotta say the aem cai gives a real nice growl to the engine. :thumbup: