I see a couple of people are going with the K&N 57i or Typhoon.

I'm interested in how the BMC carbon dynamic airbox will work with the ST? Any opinions?

The Venturi BMC filters look interesting, too...

What is the outside diameter of the air intake tube? It looks about 70mm, but I'm a bit hesitant to take it off and check (you'd be surprised what I can screw up, and the car is just too new for me to feel comfortable about mucking around....). Some of the BMC filters also have integrated Bosch air sensors. I'm not sure if I'd need one of those?

i will be fitting a bmc to mine when i get it
but havent a clue bout how to go about fitting it
until i got the car