I bought the doo used,the guy told me it wasnt running properly,seadoo starts and runs fine out of water,when the doo is in the water with a load on it and you give it a hint of throttle action it dies,i did some research and took care of all that grey line issue and replaced all the lines,cleaned out all fuel system out icluding the carburator.So to anwser the previous question,yes i do have the oem airbox on it,but i did notice that the flame arrestor was missing and was wondering if there is no flame arrestor would that have some sort of effect.By the way i have not ran the doo after replacing the lines,im waiting on new arrestor,i just want to have all the parts in placed before i go further.