I would tend to agree that the V10 would be the most likely choice given that they already put some development towards it for the '99-00 car. But I wouldn't put it past Porsche to come up with another solution. They certainly love their twin-turbo flat six and I can see them re-vamping it to make it a winner once more. Porsche also had experience with turbo-charged V8's in their short stint in CART during the late '80's.
Another reason they chose not to use the flat six though was that it couldn't be a stressed member of the chassis if I recall.
|