If they're colour coded (I don't know for Lupo Sports) then no harm in keeping them on, especially if the car is black like yours. If they're the same black plastic as the bottom of the bumpers, then I'd personally take them off. I took mine off and haven't regretted it, I see it almost as a must-do mod. Only downside is be careful when taking them off or you'll leave a few marks like I did. Underneath where the strips were, my paint is ever so slightly, a different shade but isn't noticed by anyone in my car but me (honestly) unless I point it out. Also, if a job is worth doing, it's worth doing well - so be prepared to take the glue off! Take them off if you're going for a Euro-esque look. Smye