Heres a very cool and detailed tech article from motoiq.com.
Some selected quotes
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If you do a google search on these cars, you will not find much information on them because until now, no one that cares has gotten a really close look at these amazing machines.
The team's engineers were very quiet when we asked them about the engines specs and we were not allowed within 20 feet of the engines or any internal components.
The engine is forced to breathe through two tiny 29.4mm restrictors by homologation rules. This is the main reason for the low sounding power numbers. Since the airflow to the engine is limited, the engine is redlined at a relatively low 8,600 rpm as there is simply not enough breathing to efficiently rev higher.
The engine's exhaust exits into 4-1 headers with a crossover pipe just past the down tubes. The exhaust is sunk into the floor for better aerodynamics and fits into a double wall oval section directly under the car. A unique feature is the double wall exhaust and heat chimney.
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Make sure to read the entire article over @ motoiq.com:
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