Originally Posted by Comfort

Here's the Volvo engine Review by Car and Driver- 450 HP 2 liter engine coming soon....
The engine uses a 48-volt electric supercharger that sits upstream of twin BorgWarner turbochargers, and which is fed by a supercapacitor power pack sitting in the trunk. The supercharger doesn’t feed the cylinders directly except incidentally, working instead to pre-charge the air before it reaches the turbos and helping to spool them up and reduce lag. The turbos themselves are plumbed in parallel, with one breathing gases expelled by cylinders two and three and the other getting spun by cylinders one and four. Each delivers up to 50 psi of boost and peak power arrives at 6500 rpm, relatively high for a modern turbo. Unsurprisingly, the fueling system needs high-flow injectors and twin fuel pumps to keep up.