[alphaone]

You do realize that spoilers do what their name says, they spoil the airflow. Spoilers are very bad things to put on cars unless you plan on going very very fast (then you need them to dump the lift your car creates as the body basically becomes an airfoil at high speeds). Otherwise, they just look stupid and add weight and drag.
As for the speakers, I have a similar opinion about them. They just add weight and are overpriced.. You should be listening to the sound of the engine in a car like that anyway.

Just my 2¢