Whatever you do, dont just do the "rip out the brant" fix then find your car stolen a few months later.... fix it, get the brant internal battery changed, simple fix ...or sometimes its a sign of your cars electrics affecting the brant (any electrical power fluctuations affects the brant, get tested and replace car battery/alternator if needed)... only rip out the brant when all avenues have been exhausted, who services the car by the way?

Could be a vacuum leak somewhere somewhere or a long list of other things too.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...