The 1.8L with 5 speed manual transmission is by far the slowest car I have ever driven, but, the car is the funnest car I have ever driven during the winter. This car can feel like you are driving a toy car around if you have driven other manual cars this is a bit jerky driving but the gas mileage is good. Not very much for modification out there if you don't know what to look for but if you know Subarus you know what can be done to this car, very cheap to make fast but needs a engine upgrade almost for sure.
Manual transmission and body style.
I would say upgrade wheel size is a must to take advantage of the awd. If you want speed the motor is also in need of upgrading do to the power of the 1.8L motor having none at all.