Hi and welcome. We have the same car lol. Well mines not quite standard any more. I bought the car thinking it only had a pro drive exhaust added. So far I've found out my car is not a factory ppp, but could have been added at a later date. Anyway the only differences I can see from a standard is the exhaust, maybe fuel pump, and the intercooler hoses. I've since added a cosworth panel air filter and then had it remapped and I'm currently sitting at 285bhp. So it wouldn't take too much to reach the figures you want. I trying to decided if I want to brake the 300 mark, to do this would need a bigger turbo, pink injectors, fuel pump and tbh the cost is out weighing the gain. Just bear in mind the 5 speed gear box won't be able to go much above 320-330 without causing too much strain. And also the standard turbo (td04) on a WRX will only reach 280-290. So I think I'm at my limits as is. If any part blow, I might upgrade then.