Kumho XS Tire vs. Dunlop Z1 Star Spec?
I'm looking at a new set of tires for my 05 Mustang for autocross and some street driving. My last set was Kumho MX 275/40-17 on 17x9" wheels and they were pretty decent for a drive to the AX, compete and a drive home. Now I am considering the Dunlop Sport Z1 Star Spec and the Kumho XS as replacements for the older MX's.
I have experience with the Dunlop on my Toyota and they worked very well, but the largest sizes I can get are either 255/40-17 or a 275/35-18. I would prefer a 17" tire as they are much more affordable. In Kumho I can get a 275/40 or a 285/40 tire in 17" and at a good price point. I just don't know which would be the better AX tire, which is my major concern.
Has anyone tried a set of the Kumho XS yet in an autocross? Any comparisons to the Dunlop would be a plus. I appreciate any input I can get.