from the rims, exhaust, rear fenders front and rear diffusers, it shows to be a 4.6iS
I can see the side badge to say 4..but it isn't clear.
Definitely not 4.8iS, as the front diffuser for the 4.8 is different.

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JL
'02 x5 3.0i
-Black on Titanium Silver (354)
-Sports Package
-Smoked LED Side Markers
-Chrome Gauge Trim Rings
-Retrofit AEs (Favorite Mod)
-Front & Rear OEM 4.6iS Diffuser
-Front & Rear Fender Flares
-K&N CAI