Whatever money you spend to make it faster N/A you could have just put towards boosting. A standalone and tune would be a lot and you would to change a lot of parts to ever make any ECU and tune worth it.
I had a GE with Dezod headers, SRT catback, SRT intake with their "ECU", Brian crower 264 cams, titan exhaust came gear, and FRS 4.10 LSD rear end.
The car sounded great and was for sure faster than stock but with the thousands spent on that it could have all been put towards boost. To me it was worth it because it made the car very enjoyable.
Also had a lot of suspension mods but that doesn't help it go faster.