withou aircon i think you just need to take a little out the slam panel on the drivers side to feed the pipe back up.... i had to take a little out the bottom bit and i lost the plastic bumper bar too..
tho that might have been because my IC is as deep as matt could possibly get made to fit there 
oh and to answer the original question.. no not all dervs have A\C but a lot of them do as they most came in + spec
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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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