the only thing different between carls and this guy car is that heath Robinson intake and SFS discharge/charge hoses.
carl is using evoms and neuspeed discharge and charge pipes. you can be pretty certain it isnt worth 43Hp difference over carls. 280hp is widely regarded as the highest output you will see on k03 and thats with all the trimmings and garnish work.
i think as carl said earlier, this guy must be talking about the older model RS4 bi-turbo, either that or hes talking poo