2.0L STi with standard ECU calibrations deliver c. 265bhp. On standard engine internals with a professionally remapped Denso ECU and supporting Turbo, induction, fuel pump, Injector and exhaust modifications they are capable of safely delivering between 400-420bhp without adverse affect all day long. I’ve heard genuine stories of 2.0L STi cars delivering over 500bhp on standard internals and without adverse affects in regular daily use long term, however the more power you push from these standard engines the more likely they will be to have a terminal episode so we have to be sensible about modifications and levels of remapping.

No reputable tuner worth his salt will advise you to push your engine above its capabilities and will always recommend safe levels of tuning that are well within your engines safety margins while still achieving optimum power output. We are no different. Nevertheless that’s how strong Subaru engines are.

Being a very high performance vehicle it is our firm belief Subaru’s should perform as such and still be capable of delivering better MPG during daily use when remapped. Subaru’s are unique in their design and coupled with an asymmetrical 4WD system the Subaru Impreza is arguably one of the fastest and best handling motor cars in the world with genuine exotica/supercar humbling levels of performance.