can anyone please help me figure out what happened to my truck???? i was drivin home and suddenly i just heard, what sounded like, a massive air leak. it sounded like it came out of the exhaust, but im not for sure. i dont know if my wastegate is bad and my boost is just running out the exhaust, or if i blew a head gasket. whenever im goin by a building or something that eccos the sound of the exhaust back, i can still hear a massive hissing sound coming out..... Please Help