It's juste the fixings. It is thicker than the original one and the Carlos Sainz WTA so you have to move it a few centimer on the right if I remember correctly. If you don't, you won't be able to close your hood properly.
You need to bend the inlet pipe to the right a few cm and if you're staying with the 2nd gen throttle body you'll need a silicon reducer I think 2.75" to 2.25"
Someone did post a how to on the boards a while back.