Update on exhaust leak. Took it to mechanic, he kept it for couple days and couldn't make up his mind on fixing it , saying that he needs to lift the engine and if he had to take the manifold out and break the studs than repair will be a night mare and expensive and advised me to get rid of it and buy a newer car. So I took out the car , sat till 2 am in the morning and bumped in to a video on you tube where the guy was having the same exhaust noise as mine and explains on the comments that all he did is change the o rings on secondary air line and tightened loose bolt. That's what I did too an hour ago. Voiala , no noise , engine works like new)))this video saved me couple thousand and the frustration . Just wanted to share if smbd has the same problem after the timing or vanos Check your secondary air line and replace those 2 O rings just in case ))))