[Perfectlap]

Not sure since I haven't ax'd in a while but going to PSS9 will move you up at least one class in many clubs which will make it pretty hard to place well.

I'd also recommend going with a smaller wheel for AX. Cheaper tire cost, more options, last longer/peform better. With a race jack and impact gun you can switch over in less than 10 minutes and drive to the event. I have Bridgestone Potenza RE-11 which are awesome stickies, closest to the r-comps I ran one year, but at 18" way too pricey to shred up on some oatmeal black top. But generally you should wait until at least ax # 10 before spending money on new tires. Early mistakes in a new car make for lumpy tires.