how far away is the maf from the turbo? is it in the stock location? what bov are we talking about here? also a good way to tell if you are getting a good fresh motor besides doing a compreesion test is to is to pull the hose on the valve cover that goes to the oil catch and put your thumb over it. If it has some suction thats good if it doesnt and it pops a little when you cover it then thats not so good.