This 1991 Mercedes W124 500E was built by @w124036amg in Nur-Sultan, Kazakhstan. They replaced the factory 5.0 L M119 V8 and four-speed automatic transmission with a 6.2 L M156 V8 and 7G-Tronic seven-speed automatic transmission from an E63 AMG!
The transplanted engine produces 507 horsepower at 6,800 rpm and 631 Nm (465 lb-ft) at 5200 rpms. The car has also upgraded brakes and stops thanks to his six-piston brakes on the front and four-piston brakes on the rear axle.
More info about the build and the work that has been done to make this fit can be found on this LINK! I can tell you that wasn’t an easy fit! They had many hours and custom work to make this all fit.