hey porsche guy

Typically (read: 99% of the time) automotive designers throw turbines that are far too small for the engines in reality. They make very small turbines and housings in order to make the car spool easily and run with nice wide power bands and gobs of torque.

These small housings and tiny turbines are HUGE amounts of backpressure on the engine once you romp it and bring the rpms up to a respectable amount.
But i forgot you knew everything so i didn't need to explain that to you.