The driver of a Ferrari 458 Spider has decided to follow a McLaren P1 on its way back to the McLaren Technology Center. This guy was out for a ride and when he spotted the McLaren P1 he started to chase it. 
 
As you already know the McLaren P1 will have the combined force of two highly-efficient power plants. A mid-mounted 3.8-litre twin-turbo V8 petrol engine and a highly effective electric motor give a combined output of 916 hp and a maximum torque figure of 900Nm, ensuring instantaneous throttle response through the rev range, more akin to a naturally aspirated engine.

The petrol engine produces 737 hp at 7,500rpm, and 720Nm of torque from 4,000 rpm. The lightweight electric motor, developed by the McLaren Electronics arm of the Group, produces 179 hp, and is unique to the McLaren P1.
 

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Source: Youtube