I have recently had my engine seize up on my 56 plate seat Leon 2TDI after using a turbo cleaner on it, I have bought another BKD engine for it and the Inlet manifold is different, the one on the original engine is plastic and the donor engine has a aluminium inlet manifold on it. I belive the plastic one has swirl flaps and the aluminium one doesn't? But I'm not sure, and I am also not sure on what one to put on. And what effect it may have on performance etc. Please help me 
