I understand that the STi doesn't take that well to modification. Even the addition of an aftermarket exhaust can cause problems due to the internal wastegate in the turbocharger not flowing enough and leading to boost-creep. This cannot be remedied without either replacing the factory turbocharger w/ one that has an external wastegate, or removing the factory turbocharger and doing some porting on the stock unit.
That said, I'll be getting an Evo.
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