This 1991 Mercedes 300SE W126 started life with a 3.0 L M103.980 inline-six. However that has given way to a turbocharged Toyota 2JZ-GE inline-six. The 2JZ features a T04E turbocharger, Hilux aluminum radaitor, factory Toyota ECU and wiring harness, and DET3 piggyback controller. A Toyota automatic transmission sends power through a modified driveshaft to the factory rear end.
Source: eBay.co.uk via Unique Cars for Sale Europe FB page