It's actually really simple. You just need the parts which you can get from a number of vendors like
www.getbmwparts.com. You need the intake manifold, the 2 DISA valves, a new gasket set, and the screws to attatch the motors to the manifold. There's also a new PCV hose you need as well. Lastly you need new engine software which any tuner can help you with. I'm trying to get a package together but my tuner is slacking off a bit.