What is that noise?
Id definatly say header leak. Sounds exactly like mine did when my headers came loose. I was flipping out and my dad was like chill the **** out its just the headers, so I tired and sure enough the back two bolts were loose. Tightened them up and problem solved. As long as your oil pressure is the same and everything Id guess headers. Grab a 10mm and try them at least, it only takes 5 seconds....
