Sport class is your best bet on a Warrior. You'd have the largest motor allowed in the class, which could be an advantage. Six ply tires, a beefy front bumper, and some skid plates (and don't forget a tether) could get you going at first. Try it and see if you like it. If you do you can get into suspension, nerfs, etc. Just make sure you like it before you go overboard. You're talking about racing for 2+ hours at 110% speed, it's not easy and it's not for everyone.