In case of the sequential bi-turbo that is parallel setup and sequentially operates, only one of the bi-turbo.

Bugatti Veyron engine
four single turbochargers (sequential quad turbo)
every turbocharger is used for four cylinders (4 x 4)

The requirements for charged SI engines lead to conflicting goals when laying out exhaust turbochargers. On the one hand, a larger exhaust turbocharger is meant to achieve a high output, while on the other hand the maximum torque should be reached even at low engine speeds without creating the impression of a turbo lag.

Fuel consumption potential through cooled exhaust gas recirculation and cooled exhaust manifold
However, increasing the mean effective pressure is limited by the occurrence of unwanted pre-ignition phenomena.

HiSPD (High Specific Power Density) Technology
Less slot area and less volume.

Best thermal exchange => more
current density => less amount of
copper

Little headers size.

Magneti Marelli MGU - MEDIUM RANGE MOTOR 60/120kW

Use motor-generator unit (MGU) in place of alternator
Power electronics control the MGU

HERS (Heat Energy Recovery System)
Concept for high performance race engines as well as innovative road vehicle applications
Developed by Magneti Marelli and APC (Advanced Propulsion Concepts)

Morse Gemini systems are a set of 2 chains which run on phased sprockets. This patented design significantly reduces the overall NVH (MORSE GEMINI chain systems for noise reduction.) in the system.

Ford Racing will supply a new EcoBoost 3.5-liter turbocharged V6 race engine for Michael Shank Racing's Daytona Prototype entry in next season's Tudor United SportsCar Championship.

750 HP for Ford's Record Run attempt, and 600 during its competitions.