This video clip mentions the S5 "supercoupe" to be 500hp....Not sure of the legitimacy of their source(s)...

One can hope...<ul><li><a href="http://www.fastlanedaily.com/episode/fld_20090310">500hp?</a></li></ul>

<ul><li><a href="http://www.autoblog.com/2009/03/09/rumormill-audi-tt-rs-rs5-coming-stateside/">http://www.autoblog.com/2009/03/09/rumormill-audi-tt-rs-rs5-coming-stateside/</a</li></ul>

Could they fit the V10 in there?

If the report is true, I don't see how the car can have anything but an FI motor..

Im sure some will disagree - but the RS4 motor bored the hell out of me when I drove it.. It wasn't the lack of power it was the power band.. Drove the RS6 V8TT and boring was the last thing on my mind..

Had a great conversation with a contact at quattro GmbH today and learned some very interesting things.

We were talking about the RS5 and he mentioned that it will have pretty much the same normally aspirated V8 as the B7 RS4, but with about 450 hp.

One of the limitations on the B7 RS4 was the challenge of getting enough air in and out of the engine - that it was pretty much 'choked' in the B7 RS4. There's just not enough room in the engine bay to deliver as much air as the engine needs to produce all the power its capable of, and not enough room for a proper-sized exhaust. The B7 RS4 has one throttle body and one air intake, and the RS5 will have dual throttle bodies and three air intakes - one of which will open only at above 5000 rpm. It 'should' also have a larger diameter exhaust system to help with the exhaust flow. Different engine management will also help with the power.

The throttle body conversation intrigued me a bit. He said that the RS4 throttle body measures 90mm and that the RS5 will have dual 70mm throttle bodies. Potentially one could replace the dual 70mm ones with dual 90mm ones and re-tune...

There will not be a B8 RS4, only the RS5.<ul><li><a href="http://forums.audiworld.com/rs6/msgs/45554.phtml">from the RS6 board</a></li></ul>