No they do have a purpose to create more downforce and air flow.
Check these out! Same bumper made by voltex with different conrads to great more downforce and better air flow
PMSL @ conrads. Thanks for the advice.
Tell me how your conrads are related to a JGTC car, besides the sticker?
Canards don't create much downforce at all, look at them, they're tiny! The purpose isn't to create 'better air flow' either. In fact they're meant to create vortices to manage the high and low pressure spots at the side of the car, maintaining downforce.
That is of course presuming the canards are designed for your car and the rest of the kit. If they're not, they're just creating drag.
If you actually have more than a cosmetic interest in your aero appendages try these:
http://www.amazon.co.uk/dp/1844252302/?tag=cliospnet01-21
http://www.amazon.co.uk/dp/0130646334/?tag=cliospnet01-21