Question: what is the difference between twin turbo and biturbo?
Answer: The term twin turbo has been often given to vehicles that use sequential turbos, a small one for low rpm torque, and a larger one for higher rpms and power. The biturbo system uses two equally sized turbos, one fed by cylinders 1-3, and the other by cylinders 4-6. They are not sequential or in series, but in parallel.