I don't know how it will sound but I went for the Sport version as I did for my M6. I love the Eisenmann Sports on my M6 so I figure it will be OK on the X5 as well. I'm just looking for a better growl on the V8 and they told me at Eisenmann (exhaust was still in development when I ordered it) that this was exactly what they are working on. We will see.

__________________
M-individual
____________________
07 M6 Conv - Individual (Ruby Black - Full Merino Gold Brown) - ACS Type V 20"
____________________
BMW X5 4.8i (E70) - AW III - Napa full leather black + aluminium trim - Sports + aero pack - 22" ACS Racing wheel Type IV Magic Black
____________________
Ferrari F430 F1 - Bianco Avus - CS brakes
____________________
On order - delivery 09: Ferrari 599 GTB Fiorano F1 - Rosso Monza - full CF int - CS brakes - nero challenge wheels