I've drove the green ttrs back when I worked at pipercross earlier this year, bonkers is an understatement.
Got a mate who had a TT RS, did the remap, cost him £400 and it was just a bit over 400BHP, it was crazy and far quicker than an R8 V8 version without doubt.
Intercooler, intake and exhaust and they sit between 440-460BHP, intercooler £500, intake £200, exhaust £1000, Audi seem rather OK with the modding too, were ok with the guy I knew, but at end of day his engine did not let go, I suspect if the engine exploded then it would be a different game.
He used to go to a lot of the race days, like VMAX etc. and most cars it went up against he beat and just like those guys in the M5 were rather surprised and upset as to how it does it.
I don't get it either, 400BHP, 1450kg, 4WD are generally not so quick unless with like crazy power or if they are a GTR. But the TT RS having driven them is so easy to launch, has power everywhere and they go like absolute smelly stuff of a shovel.
Only if they were more fun and engaging to drive.
In answer to NickXX the R8 V10, is 0-60 in 3.8s and quarter mile in 12s flat. A stock 2012 TTRS which now have 365BHP do 0-60 in 3.9s and quarter mile in just over 12s. Based on that I'd like to see a Stage 1/2 TT RS run against a R8 V10, I think the V10 would edge it, but I think you'd be very surprised as to how close it would be. But the V8 R8 is beat by the stock TT RS!