K04-001 was never used in a production car.
But was a "PnP upgrade" for transverse K03 engines straight from KKK/Borg Warner.
Audi TT came with K04-020/22/23 (in regard of K04)
K04-001 isn't going to put out any notable more power than a K03-052(K03s)
But it's a easy start if you're just getting in to tuning