I run Toyo TQ's, they are the same compound as R888's but have a softer side wall. They only come in a few sizes, I run the 313/35/18 but the actual width is more like a 295 or 305 ish. I usually get 7-8k miles out of them.
For more traction I would do the whole SPL catalog in the rear suspension. All the new mustang guys are swapping out EVERY bushing in there IRS for solid stuff and there results are pretty wild. I've seen 60' times around 1.2-1.4 posted up on the forum. I haven't seen to many people in the z community do this yet.
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