Sorry... to clarify, we're not talking aftermarket here. We're talking about just that, installing the factory ones afterwards. Either way is illegal. Unless you install all the ancillery systems that gavs mentioned, it's illegal. If you DO install all of them, then I doubt you'd even be able to do this PROPERLY for under $3000 that some people have hypothesised.

So the best advice you will find, is what someone mentioned. If you order them now, you'll still have 6 months before the car arrives to save up! Just option them now.... or just be happy to wait until your next car