I never had big plans in modifying the Atenza, but somehow the Optional OEM / Mazdaspeed (depending on the catalogue you look at) bigger roof spoiler has been floating around in my mind for a while, so when i saw a new one for sale for a good price i went and grabbed it: i made a little test-mockup too. Before (Standard roof spoiler) New bigger one. needs to be painted before installation, of course… Now this is not only a styling-item but also an useful thing. Since i drive my car mostly on the autobahn from and to work this might come in handy. According to the 2015 japanese…