A bonnet is a structural part of a car. When a car is crash tested it meets Australian standards in regards to crumple zones, impact damages etc.
The reason Carbon fibre bonnets are illegal ... is not because they are carbon fibre, or fibreglass for that matter. Simple because you have replaced a structural part of your car with something unproven / untested. Now the car will react differently in a crash scenario.
It is possible to own a 100% street legal carbon fibre, fibreglass bonnet with vents etc.. but it MUST be one that has been built to ADR specifications (Australian Design Rules). These usually weight a little extra (no where near the OEM metal bonnets), cost more and come with a adr certification certificate (never assume anything is adr certified without a ADR certificate). The far better option - looks great, safe & 100% legal (not ghetto CF getting around on most fan boys cars these days).
Another option is simple get a run of the mill, non adr approved bonnet and paint it the colour of your car. This might reduce some police attention however it wont help you if your in a crash.
The last option, get a factory metal bonnet and attach a FG/CF skin on top of the metal frame work. This is usually expensive - includes the cost of two bonnets you have to destroy not too mention the labour to construct the new bonnet. Also 9/10 most cops wont give you the benefit of the doubt that its a safe a legal option. Would possible cost the same amount as an ADR approved bonnet so why bother with this option.
You could consider going the CF wrap. Seems to be quite popular these days. Cheap, and nice finish. No reduction in weight though.
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