This 2008 BMW 535xi (E61) had the factory powertrain swapped for one from a 2007 BMW M5. This means the engine bay now contains a 5.0 L S85 V10 with a Valvetronic exhaust system. Behind that is a seven-speed SMG transmission and Variable M differential. The wagon rides on a M5 front subframe, H&R lowering springs, and a set of BBS CH-R 20-inch wheels. The body features M5 front bumper and fenders, Titanium Silver Metallic paint, and carbon fiber front splitter and side skirts. You can view the unique wagon on Bring a Trailer.
Source: Bring a Trailer