HI Wallsy,

depends on way you're planning to do.

Off Road, dust & dirt you'd be looking for some sort of snorkel and air box set up.

For tarmac running a lot of guys just have the 6637 filter pod in the engine bay.
Here's mine before:
https://picasaweb.google.com/1077641...06956490467234
https://picasaweb.google.com/1077641...06948269399634

After:
https://picasaweb.google.com/1077641...17702276014194
Note:
1)air filter with blue cover right hand side of the pic;
2)coolant filter (billet mount just towards the centre from the battery on right side of pic);
3)blue Riff Raff IC boot kit;
4)small blue plug in turbo inlet running clear line for boost gauge - blue plug takes the place of the Air Intake Heater (AIH) when the AIH delete is done;
5)home made heat shield (towards centre of vehicle from air filter);
6)some wiring work behind the headlights (relays for 100/90w headlamp bulbs);
7)clean tube next to heat shield is the CCV delete vent pipe. This runs to a homemade filter & catch can before venting to the atmosphere.

Everything else in there is still stock. All info was gathered from the FTE forums, parts sourced from Riff Raff except the coolant filter which was from the US 'Diesel Site'. Yes, the post man is my friend...

FTE Aussie members here, Brian and Bryan, also good sources of knowledge and contacts!