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Depends on the rims you are using and the specific tire. Most of the autocross guys using 245/255 street tires are using 17x9 rims which 245/255 fit fine on. It's been shown fairly often using a wide tire is faster in autocross than using a narrow tire, even if you lose some steering feel. That's as long as you can get heat in the tires, you can certainly go too big.
Hoosier race tires have extremely stiff sidewalls and can be mounted on narrow rims. I use 245/40s on 17x7 rims, that's the best tire size to use for this car for "stock" autocross class. People in other classes run 275s on a 7" rim or 295s on a 8" rim. 275s won't fit on this car in the front, I tried, and using a staggered setup doesn't work well.
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