As of March 2009, a five-cylinder will be back in Audi’s range in the form of a 2.5-liter unit with direct injection; it is based on Audi’s modular engine architecture. The transversely mounted engine is force-fed by a single turbocharger and will make 330–340 hp. Torque is rumored to be around 330 lb-ft. That’s enough to significantly set the TT RS apart from the lesser TTS with its 265-hp, 2.0-liter TFSI four-cylinder engine.
The TTS coupe is claimed to run from 0 to 60 mph in 4.9 seconds, and the fixed-roof TT RS—which will be built as either a 2+2 coupe or roadster—should jet to 60 at least a half a second quicker. If customers request it, top speed will be raised to 174 mph.
Source: Car and Driver