But as turbines are designed to operate at 100% speed and nothing else they have no "throttleability" whatsoever and would be virtually undriveable on the road. The whole idea is a non-starter as far as transport is concerned, so strictly for theatricals and poseurs.
And no (shaft)turbine ever makes flame out of the tailpipe as you all know full well, so the tosser in that VW was just showboating for the gullible public. You'd think mounting a paraffin blowtorch in the boot would be easier and cheaper, and would do the same job.