The simple answer to your original question is, yes you can and yes it will fit. There are many Evos with this AEM fuel pump and the fuel pump housing and petrol tank are the same, so it will fit.
But should you put it in a stock CS1 with the intention of gaining more power? No. It's like emptying a jug of milk down your throat in 30 seconds (refer to the FRIENDS episode where Joey did this ), your throat will regulate the amount of milk that can be sent down and overflow the rest (or you will choke). Similarly the fuel pressure regulator in your car's engine will try its best to control the pressure to match the stock fuel pressure. Even if fuel with higher pressure makes it through the fuel pressure regulator (say due to the fuel pressure regulator being faulty), the ECU will see the rich condition of the mixture and shorten the injector pulse width (the duration the injectors are open) to stop the mixture from being rich.
So no, you won't see a noticeable improvement in performance, nor significantly higher fuel consumption.
If you want more power, you can do more sensible modifications like go for a high flow air filter for starters. If you insist on going for the fuel pump, then you'd want to upgrade other fuel system components like injectors and get a tune done.