I also live in Ontario, specifically in the GTA. Pretty much any mods are 'illegal' here, but I've also gone 4 years catless on my RS3 and haven't had any troubles.
With that being said, bang for buck like someone said is probably the anti wind buffeting piece. It's by far the best quality of...
I've decided to run the TEs so I probably won't be selling them anymore, but I told another member of the forum 3200 and if I do sell he has first dibs