This is the fastest, best handling WRX STI that Subaru’s in-house tuning ... comes from the newly fitted low friction, twin-scroll ball bearing turbo, a remapped ECU and a low back pressure ...

Can you imagine being a fly on the wall in the design-brief room at Subaru when the order was given to build the Impreza WRX STI Spec ... a larger, twin-scroll ball-bearing turbo, an intake ...