But what a absolute prick of a job it is. That standard one is no a problem, but with the Nismo you have to hold the plenum/gasket/throttles/gasket on the up together and screw the bolts into the 'balance tube' on cylinders 5 and 6. This is because it fouls on the brake master.
I would rather put a fire out on my face with a fork then do that job again! Having said that, it can be done!