I figured I'd chime in here, because well it's easier than finding my old thread about my car, which was largely on hold.
Spring Nationals numbers in Super Stock *SUCK* and I'm not dragging my Grand Sport out there to race nobody, so I decided I'd do the few things that we did to Andrew's car to get my car to basically the same spec. I had donated my old R-S3's to Andrew for his car, and I needed to get some tires. I don't know if the Z2 is going to work out, but essentially I opted to take a chance for the team.... Maybe they suck and if they do I'll put the old R-S3's on since Andrew has new ones. But I want to find out for sure. I can tell you they have a LOT more longitudinal grip than R-S3's do, but autocross is still about turning.
Since our cars are soooo similar, and as Andrew mentioned we drive so much alike I figured this was the best way to find out some real information. Personally, I don't believe the Rival is the end all be all answer it was hyped to be. I think it's a great tire for mid-level drivers, Andrew and I are not interested in that.
I've also got a tune from Mike @ Moto-East (who was very responsive), I'm not sure I'll have the small battery, but I'm not also on 17x9" RPF1's too. Realignment from my more street setup that I drove PA-LA-CA-PA and ran the Gateway Road Tour with, to a more full blown setup like we have on Mr. Pallotta's car. My ride height is slightly less low, and where Andrew has a delete pipe, I have a Perrin cat-back. Other than that we will both have the subframe and diff bushings done, the KW's setup the same way (springs and shock setting wise), a Strano Performance 22mm hollow bar, Whiteline C-com mounts. I have Ferodo pads and Andrew, for now at least, is still on stock pads.