Dude... OMFG.... Boost pressure does not mean that is how much air is running through your engine. GT2871R at 8PSI > T25 at 8PSI in airflow.... You will be running lean and asking to blow your motor... Or at least running close to Maximum flow for your injectors.... It is a risk for running that turbo with an untuned ecu as it may not be able to compensate for the increase in airflow into the motor....
Secondly you cannot run a N62 on a stock ecu without a piggy back or a standalone anyways....
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 Turn and Burn!
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