I have a 4.8is and my buddy has the RR, I have dusted him numerous times, even my fiance has dusted him. The Bimmer just sits alot better on the road, and holds stronger. Not to say the RR is not a nice truck, but performance wise there is no comparison, not for anything but I would also have to venture and say it depends on the drive sometimes as well. IMO.

I have also dusted the Cayenne for fun, there just not a real porshe and that's a shame because they are really nice cars. They look cheesy on the inside as well...but that's my opinion.