The CRX that have Sun Roofs in them are the SI's, if you dont have the SI, then you wont have the sun roof, if you want one you got to put it in yourself
I think what he is asking is why dose he have an air scoop on his roof?
Probably whoever had it first put it there to make it look more like an expensive super-car. Its probably held on with double sided tape and messing up your aero dynamics.