it comes with all you need - it matches the 80mm OE air feed pipe to the turbo.. so just take the airbox off and then fit the filter in its place.
the BMC is a nice panel filter, i have one of them too - sat as an emergency replacement should i need it  - although it is at rally_matts with all my other 'junk' i have taken off the car 
I am going to eventually get a decent carbon based enclosed system - or a semi-pro airbox made up; however it is the bottom of the 'to do' list.
When i eventually work out the air requirements i can then work out what airbox\kit i need to plumb in. as it stands the 180's ITG maxogen will not flow enough as a turbo requires roughly 1.5* a nasp engine's requirement. eg so air for a 3.0L not a 2.5L
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Mods Fitted
Pipercross Filter; Full 2.5" 'Wingy' exhaust; Donny Custom Turbo outlet pipe; Custom injectors;
Uprated gearbox bearings; Helix Clutch; Quaife ATB; Upgraded clutch Hydraulics; FMIC; Ported Head; ARP headstuds; Leda coilovers; 'Brembodge' 326mm disks/DS2500 pads
Dieselpowered
Fitting Custom Hybrid Turbo (1856GTBv) & controller; Remap, swirlpot, lift pump
AMW Motorsports
Custom exhaust manifold & downpipe
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