paragraph form an article online from road and track. So obviously it does serve a function.

"Another prominent exterior feature that's more about function than style is the rear spoiler that automatically deploys at speeds over 60 mph. The car looks much better with the spoiler stowed, although when up, it doesn't really affect the view out the rear window all that much. The sound of the spoiler going up and down does take some getting used to." paragraph form an article online from road and track. So obviously it does serve a function.

In regards to the srt not having a switch for manual deployment? ummm. cause its a fixed spoiler. also i think because of the increased power, torque, and speed, imo the fixed spoiler is there to provide down force right away, and it is larger, so i imagine provides more downforce. here is a paragraph in regards to the srt front spoiler.

"Visual changes to make a Crossfire an SRT-6 include adding a more aggressive chin spoiler that reduces lift and funnels extra air in the nose".

so imo the spoiler on both does provide function and is more than just for looks. exactly how much downforce? or at what speeds, still has to be determined.