I'm not sure why would anyone
I'm not sure why would anyone think 400hp is overstated. Mercedes makes more power with smaller engine. Slightly bigger turbo with VGT will easily kick 400+ HP even at the wheels if asked. Even if STI isn't a competitor to AMG, there is no reason to believe it won't come juiced up. STI has been using the same engine architecture for over a decade. Now that wrx closed the power gap, it's logical that STI leaves the boys club and advances into man's one...