A 2 stroke 3 cylinder was mentioned...
http://www.youtube.com/watch?v=PaTHK9hz-kI
Pity Volvo won't be making 5 cylinder engines anymore, they were unique and not a widespread engine arrangement which made it special. And the tuning capabilities...
http://www.youtube.com/watch?v=Ew6YwIN2IQc
I think this has a tuned 5 cylinder but i reckon the 850 fans have seen this video before