ok i have the k&n setup took the airbox out and installed it. i was run into a waterhole and the car stalled after drying out i started it up and bad knock sound altho it idles fine, my dad thinks a hole in the piston a local mechanic says bent rod but idles too good to be that i think.. i did notice smoke that it didnt use to do.. i dont know if my car has followers to the cam but it sounds like a follower on a turbo coupe has messed up any ideas or past experience will be appreciated.. thanks... sam