depends on what route you do. iirc k04-001 is streight bolt on, however doesent get a massive amount of more power over the k03s (20-30bhp), k04-025 will require a new manifold, oil lines, bigger maf, injectors, possibly throttle body.
as for induction, either panel filter in standard air box, however, if you were going for the k04-025 id be tempted to do as wazzzer stated above.