Yeh this is a tough one.. Ive seen under body scoops used..
If your trying to get cold air for your intake..
Today i got a pipe bent up for me.. after a bit of grinding etc.. The Air filter now sits below where the battery tray used to be (relocated to the boot)..
Ive got a GZE.. so ive been fighting intake temps lately.. this hopefully has solved some of my probs.. Other than that.. A couple of fans attatched to the rear engine hood to suck out the hot air would be valuable in traffic situations..