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Tony makes good points, especially on braking and brake pads. If you're not going to go to r-compounds, I would suggest getting a set of the Falken Azenis or, for a few dollars more, the Advan Neovas. Either tire in the 225/45-17 size will wake the car up dramatically. I'm running the 225/50-16 Azenis on my stock, steel LX wheels for HS and they do just fine as daily drivers and they are a lot of fun on course.
I do take some umbridge with Tony's advice on pressures. I run 41F, 34R on my Azenis and I get the car to rotate. The following is a quote lifted from Chris Shenefield on his RedShift Motorsports site:
"If you run really high pressures to get the car to rotate, you will find the car will have more of a tendency to snap oversteer. Running lower pressure as a means of getting rotation will afford less "snappiness" at the limit because the tire is softer. Furthermore, the lower pressures in back allow a slightly higher slip angle at all lateral acceleration levels; so the tire has more lateral movement throughout the entire turning sequence (from low g to high g), and that's usually what you are after. High pressures induce oversteer by actual slip of the tread (oversteer), which is a little harder to control and can catch you off guard, especially on by fast courses."
So yes, the higher pressure in the back will get you some rotation, but a lower pressure will get you a more controlled rotation. This is a contradiction to normal autocross theory, but a lot of fast guys are using lower pressures. If you get a chance to test, try both. Your driving style might also dictate which pressure theory works for you. I'm still a hack, so I prefer lower pressures to control spins. I had some real doozies in the old STS car.
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