@SuperDicq Many countries make it illegal for you to personally change anything that relates to emission standards, but I guess in most you can go get basic modifications approved as long as it passes a mechanic "inspection" and a emissions test (but you're probably not going to get approved if you roll up in GAHNOO/Car, wrapped in 100% free software livery, even if the vehicle passes the emissions tests just fine, as that level of freedom isn't allowed).