Don't worry about it, just don't post any more screens with modded content and you'll be fine. Feel free to use mods, though; it's not THAT big of a deal. Just don't advertise or distribute them on these forums. You may run into issues with racing online, too.
Hey, I have an idea! If you haven't got anything important to do, would you like to try to do the CRG-kart racing suit? It just came up to my head and I thought it would be so cool. I can search some pictures just in case you don't know what it looks like. Thanks anyway!