Spoiler question
 

I just wanna know if the spoiler that came on the '87 gxl was functional at all?

I am trying to decide what kind of spoiler to put on my 86 base. It currently has none. I have a '87 gxl spoiler and the rubberized sport models spoiler lying around. I am trying to decide between using one of these, a s5 Tii spoiler or just saving up for the corksport RE wing. Even though it will not be effective untill I hit 70mph or so I would still rather put something slightly functional over pure decorative.