A mate has just has his 3.2 v6 supercharged to over 400bhp by Turner Developments as even with base level mods it wasn't measuring up performance wise to an S3 ( search and you'll see the brief thread I wrote on it). These are not my thoughts, they were his. He decided to take this route as he'd already done Suzuka grey respray, facelift front end, and had sank too much cash to just move on. £9k later and it's astonishing. I've always loved the V6 engine, and it's character, but your figures just seemed on the side of optimistic for the hardware involved.
I don't doubt it's a quick car, it is. But there is no substitute for a flat drag strip and some independent professional standard timing equipment. Speedos notoriously overread and this makes them unreliable, and GPS is a better measure but even 'consumer' non military grade GPS has to be slightly subjective.
I'm no hater, I don't care particularly that the badge on the back says S3 as its just a variant of 2.0T. Having proactively contributed on forums for 10 years I've heard a lot of claims and stories, and I think the aspiration to keep the forum credible is that we all trade in hard facts. I hate rolling roads for the same reason, a great guide for identifying modification improvements path on your car, but a real world measure of actual performance?????
Mate I have no issue with you or the V6, just exercising the right to question!