Stock gearing and diameter tire gets you 116mph in fourth gear. Most stock turbo cars are going to be 92-102 mph depending on tune/fmic/fuel. In theory I would think 23" would give you better acceleration and still have enough rev range to not be topped going through the traps. Most people I have helped with start around 20 psi and end up around 15ish tuning it for conditions. I've seen as low as 13psi needed on colder days.