My opinion: I love it.
A purposeful, clean, functional spoiler (preferably painted flat black), could be just amazing on there.
My only concern may be related to @Rainy Day Auto 's comment where your car looks too nice to be permanently mutilated with add-ons that you might change your mind about years down the road...so (again, IMO) a reversible attachment method would make it even more interesting. Then again, it's your car and it looks like you've done a nice job with the mods you have going on so far :D
Well now you have me thinking about how I might do something like this on my Dart. I never completely loved the Direct Connection style ducktail and I couldn't make myself drill through my trunk lid to put one on anyway....so this style really is appealing.
I have a similar looking aluminum piece on my Mustang GT made by RTR and it works. The pic isn't my car but same spoiler (I have those wheels too)...so you get the idea.
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