Hi i have a wrx 1997 import with exhaust done,dump valve,de-cat and performance panel air filter and i do not know what to next to get more power from the old girl

 

Walbro pump would be next.

You have a MY97 or 98 "phase 1.5". Unfortunately, you have to replace your ECU to be able to get a remap done. The most common, cheapest candidates are the Apexi Power FC and the Simtek.

If you replace the std 380cc inj. with 440cc or bigger you might just get into 320bhp territory (limiting factor of the TMIC comes into play) after the remap. But expect between 300-320 (I think).