Regarding whether or not to have a spoiler, the audi TT or the nissan Z, can't recall off the top of my head, at one point removed the spoiler from its design, and started to have traction control issues at speeds over 100mph, thus it was re-introduced in the next generation. I know that this is a different car, but I can't see it creating huge issues going the speed limit. just my two cents.

Isn't there a thread on here about removing the spoiler to get rid of rust issues that can occur underneath it?
Regards. Steve