Apart from the cylinder head and the ECU it would also require a suitable exhaust manifold, a control system for the turbo and induction plumbing and an intercooler if you want one. The injectors may also have to be upgraded, etc It's not just a question of bolting on a few bits I'm afraid.
Oh i know i just wanted to know what needs doing to get one on my motor as i have no idea.. But i want to learn things like this!
Im getting a new exhaust for mine anyway, im off down on tuesday for a quote with motorsave suppliers to see what kinda price they can come up with, i want a performance exhaust that sounds nice and will go with how my cars going to look in a few weeks.