1. semi-slicks usually worn by ferrari and maserati track junkies.
2. comes stock with stradale.
3. horrendously expensive.
4. bald in a couple of thousand clicks of street driving.
5. you're probably better off with pilot sports cup which cost about $500 per piece.
6. I have sport cups which i've tracked for about 2 times. now in hurry tyres gathering dust. In 18-225/40 size. if you'll like to have a feel of what semis will do to your car, go down and strap them on for free. If you like them, i'll trade them for a bottle of chivas 12. hehehhe. if not just dismount them and return to hurry tyres.