The RSS F3 V6 and the F2 V8. I've had a running argument with RSS about their tires, which seem to heat up and cool down abnormally fast and run hotter than I think they should. I like my tires ca. 70-80 C. They seems to think 90-100 is fine, but I find the glowing red tire icons disturbing. That said, the F3 is a delight to drive; the F2 requires more concentration than I can muster.