Totally agree, its not on at all.
To clarify, if the other gti you drove didnt make the noise, why do you think it might be normal? If the other gti did make the noise then it maybe a design fault but if its just on our cars then its surely an individual problem?
Im gonna take mine back in if i get time this week, i'll take a techncian out to some hilly roads to demonstrate it getting worse when the engine is under load...