Depends how much your looking at spending.
I'd be looking at a bigger Intercooler as the early wrx one isn't great, possibly a change of turbo, a power FC ecu, a decat downpipe and system, probably keep to 2.5" if your wanting to stay at 300bhp, maybe something with fuelling.
A good health check on the car too with a diagnostic on a rolling road
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STI Type RA v3
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