18" Tire selection for autocross 9-10" rim

[V6Convertible]

I have heard bad things about driving race tires on the street. The course I race at is still a good 45 min away.

I have read that the Kumho mx's are just a little shy of the performance of the kd's but much less expensive.

Any opinions on the mx's? or on Tire size?

I was thinking 265/35 on the front and 295 35 on the back.


Stan