This custom Volvo S40 was built by DA Motor in Kållekärr, Sweden. The car was converted to rear-wheel drive thanks to a custom tubular chassis and BMW M5 powertrain. The engine is a 5.0 L S85 V10 producing 500 horsepower and 384 lb-ft (520 Nm) of torque. It sends power through a BMW ZF manual transmission to a M5 differential.
Source: DA Motor FB page and GarageT via Florin
Wow, this is some beautiful work!