No one could expect anything else but 4.2 in this car, and this is last N/a engine we are going to see from Audi, so in some way I see this car littly bit nostalgily!

When it comes to 4.0 T, I think that option never was disscused for such a small car as RS 4. That engine is reserved for bigger Audis, while next gen' RS 4/5 will be powered with 3.0 T engine...