This bout between the ST and the AGP sounds like mutual assured destruction.
Very soon you'll have found out he has gone and got the Mountune 180 kit fitted to his ST. So of course then you will have to go and get the SS fitted to your car.
Before you know it the pair of you will have roll cages fitted to the car, and stripped them for weight. I actually think the ST is an alright car, but it lacks some the Abarth has bags of and thats character.