MNNTHBX ( mnnthbx.com. It's short for "man in the box") was the first company that popped up when I started Googling undertail kits. These guys specialize in small bikes like Honda's Ruckus and Grom, and the KTM RC390 and Duke 390 are right up their alley. MNNTHBX's fender eliminator kit is just $89 and allows you to hack off that massive appendage hanging from the RC's backside. It's a simple kit that's really easy to install. Reusing the stock turn signals meant there was no need to solder or splice wires, and while there's no separate license plate light, the stock LED taillight casts plenty of illumination onto the plate. Nifty LED bolt lights are available if you want proper illumination, but I'm happy with this setup. Total install time was about 15 minutes, and the bike looks so much better now.