Fail.
Injectors don't make power. Fuel pumps don't make power. TMIC don't make power.
They do allow you to support larger turbo's and more agressive tunes.
If you still have the stock TD04 turbo, injectors are a waste of money. Also, given you have a 2002 WRX, you can just decap your current injectors making them 816cc. Then you can have some money to buy a VF34 turbo.
The things you should be spending your money on are tune/
ecu. Decide if you want stock
ecu or aftermarket, speak to your favourite tuner and go from there.