So I got into contact with that guy that is the owner(?) of the Renault 2.0 Team that has the slicks that were advertised on the FAQ. What size should I go with? 240-45-13 or 180-50-13 for autocross. Also, I have turbo flares so that takes out some of the problems.

What width are you running? 240 and 180 are quite a stretch from each other.

you could probabaly fit 240's with you flares as long as the wheels are the right offset.

The 240's are closer to stock size circumference (stock-74.3", 240-67.5", 180-63.1") Your speedo will be out (read faster than actual speed) for example 4.11 diff, 5 speed, 70mph = 3300rpm (165/82/13 - stock), 3700rpm (240/45/13), 3900rpm (180/50/13). But that should not matter if you're racing it. It would be like having a 4.52 diff. Beaner7102