When I get back on either mid-tour, or back for good from Korea I am going to more then likely install 355i turbo's from Brian. I kind of looked at the engine, and it looks like to remove the front turbo all I need to remove is the front heat shield; pipe connecting turbo to front pre-cat, and associated hoses. Now as far as the back one goes, pretty much the same as the front. But by looking at it I would have to remove it from the top. Is this the case, and if so is it mandatory to take off the plenum?