is my injen CAI taking in water?? or is my exhaust?

[nakz]

This never had happen before but i have recent installed a new exhaust system (Greddy evo 2 catback) and everything was fine until i drive my car (dc5s) in the rain and going over a small puddle of water.. the engine or the car starts to vibrate and acceleration seems to slowly response(lose power) and engine will make a funny noise and this will stop a few meters away and everything returns to normal.. then it'll start to happen again if i drive over another small puddle.. is my Injen CAI taking in water or is it my new exhaust system?? becuz this problem never happen to me before with just the CAI..