This 1998 Mercedes G320 Cabriolet (W463) originally came with a 3.2 L M112 V6 capable of 215 hp (160 kW). It is now powered by a supercharged 5.4 L M113 V8 from an AMG G55 Kompressor paired to a six-speed manual transmission. In factory specs the supercharged V8 made 342-362 hp (255-270 kW) however the listings on Alliance Auto Care and Nothing but Gs claim the V8 is now making 680 hp (500 kW). No indication if the drivetrain is upgraded. On the outside you find a Ruby Red metallic painted body with a 18-inch wheels holding Michelin Defender tires. The listing states this is a one-of-one and thus commanding a price of $285,000.
Source: Alliance Auto Care and Nothing but Gs
“In factory specs the supercharged V8 made 342-362 hp (255-270 kW)”
That sounds more like an output of the naturally aspirated version. Supercharged version produced around 470 HP.