Exceptional handling. This car will "turn on a dime, and give you a nickle in change". High RPM powerband will quickly remind you if you are in the wrong gear. The five-speed manual trans is a must. If pure acceleration is your thing, then go for a Type-R model.
Larger diameter wheels. The stock 15" look too small on this car. I have used 16" with low profile tires and it vastly improves the appearance and also the handling, although the ride becomes a bit rougher because of the tires.