I think the problem with this legislation is the grey area it creates. Police have MORE authority to decide what 'happened' and the appropriate punishment for hoon behaviour. If hoon activity occured there should be punishment within reason. End of story.
But what this does it propogate the stigma that anyone who modifies their car is a hoon. Even if you drive a 400hp Skyline to and from work, like a granny, pay your registration, follow the rules, give way, indicate at turns and hand over your money for ridiculously priced premium fuel- in the eyes of most police you will always be seen in a negative light. You can be pulled over without warning.
To those of us behaving maturely these laws won't really effect our lives. But bear in mind that you have LESS chance of defending yourself whether you are right or wrongly accused of an offence, and MORE likely to be viewed with contempt.
This stigma of modified cars ruining society is the problem. Hoons ruin peaceful streets. Illegal modifications ruin the environment. Enthusiasts and legally modified cars are as good for society, and social culture, as home renovation and fashion shows. Apart from SAU events and track days, being an enthusiast takes up a decent proportion of my social life and has made me a number of friends.
So i agree with some of the other posts, that we need to make the effort to remove the enthusiast community from under the banner of HOON CULTURE. In a way we need to be viewed the way citizens view Porsche and Ferrari drivers, with something like a halo around our heads. That'll take some time to achieve, hopefully these laws will make it easier if we band together.