Have you considered just getting the PossumLink retuned? I've had two WRX's with old Links, and they've both been fine to drive daily when tuned properly.
It could be a mechanical fault causing your problems.
WHat exactly is your car doing, or not doing?

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i