Police Sierns as roof option

[scaftz]

Having sirens would be cool as tuning option, would be annoying when overused. Think about how many newbie Mananas will put one on their car because simply it's the most interesting visual tuning available. Unlocking it should be at least consumes one's soul hard enough so that only those who are really dedicated into obtaining them can have it on their car and making it feels even more special.