Kumho MX, by far.
Kumho 712s SUCK. Let me repeat...SUCK.
ES100 is only an OK sport tire...good for daily driver, OK for track.
Old Azenis Sport...too slippery when hot. Decent for auto-x, bad for track days.
New Azenis Sport (RT-615)...good all around tire, but PRICEY. My #2 choice...
FM901 is grippy, but has a SOFT sidewall. Little too sloppy for me...
And Kumho MX kill them all (RT-615 excluded)...great tire for the $$$, gets better when hot, lasts a decent amount of miles, etc...I've had 2 sets, been VERY impressed. That's for auto-x, track days, and HARD street driving with ~300rwhp.
...
I've owned all the tires listed except for the RT-615, so that's my real-world experience.
And FYI...lots of guys are actually starting to use the Hankook tires for autocross...so look into those as well.
- Brian
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