Old thread, but worth revisiting.
Still K04, but fully tuned on E85 making pretty good numbers (with the "rear ended by a bus" torque onset the little huffer is known for). The S4v2 should be here any day now.
I had Kumho ecsta 225/40/18 and they were good on a mostly unmodified car. As soon as I got it tuned they were useless.
Went with Potenza 245/40/18 next. They were better, but would still go to full roast in 3rd.
Now running 255/35 Pilot Super Sports. Best tire I`ve ever had (and believe me, when one of your best friends is RVP for Discount Tire, getting to try out good tires isn`t an issue). Sure, if I just rev and dump it redneck style and it`s going to liquify just about any tire in first and second. But with the PSS if I`m smooth with the throttle they`ll bark a little in 1st and right into 2nd but they hook up almost instantly and it`s off like a rocket. The NT05 might be a softer tire, allowing us to be more careless with the throttle, but the lifespan is shit. And with the AirLift bags in the back the car doesn`t squat and the PSS hook up like a drag radial (once they`re a little warm, of course). They ride comfortably and are super quiet as well.
Made me laugh when I got the PSS and drove away from the shop the first time. I used to run drag radials on different cars back when I didn`t care about getting less than 10K miles out of tires, and I`d always hear pebbles and whatnot being picked up by the tires. The PSS do the same thing, only they`re a 30K mile tire and I just had a little chuckle about it.