[husker boxster]

I would use the 18s, no use wearing out your daily shoes.

Regardless which route you go, give those tires some time to warm up. Don't dive into the 1st turn going hotter than a pistol or you'll end up in a spot of bother. When I DE'd with PS2s, it took a half lap (over a mile) on my local track to get them warmed up.

Rocking your car back and forth like they do on a NASCAR restart will not warm up street tires. Straight ahead will work, but it takes a while to get them warmed up.

Super Sports are pretty good right out of the shoot.