Subaru americas called to make a reproduction of the Impreza STI
Certainly the most frightening thing of what it really is. Subaru americas has appealed to review all Impreza WRX STI to make a relevant reprogramming of the ECU. The reason for this appeal is that under certain circumstances, maintaining the boxer of 305 Cv over the red line could be very damaging to the engine itself. 
Virtually all engines have, in their programming, a routine that cuts the injection when it keeps the engine revolutionized over the red line for a considerable time. The 2.5-liter boxer is not lagging behind, but in certain circumstances the engine could remain at the top and cutting injection might end up with a bad combustion damaged parts such as pistons and destroy the engine.
It is true that if you buy a compact of more than 300 hp, it is very likely to "play" with him and the red zone is more common than they would in a car less powerful. That is why Subaru has decided to launch this reprogramming to prevent damage to the engine boxer, commenting for the most demanding owner that this change in the ECU does not affect the performance that has the Impreza STI in themselves and simply will protect itself when it exceeds 6,700 rpm.
I wonder if they have concluded this problem in the boxer by evidence or because there were several instances in which some drivers were injured. Anyway, it is all very well not hide this failure that might be unlikely and, of course, the rescheduling is free.