what size, for front only or front and back?

assuming your money situation is similar to mine, youre not burning through azenis in the rear. if youre talking 205s up front, i would say 35psi is about good. a lot of people (myself included) who looped it in that sweeper were too heavy on the throttle, or just coming in too hot to manage their speed, so tires may not be the problem.

2 lbs of air pressure makes more difference than most people would guess, id give it a try, but trying different runs at different pressures is the best way to find what makes your comfortable. check it after every round!