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My 03 WRX is stage 2 with an STI up-pipe and an aggressive tune. I get boost pretty much instantly. But it still doesn't have the same response as a N/A car.
I think the BRZ is a car that requires a very responsive engine, and a turbocharger is not going to meet that requirement, no matter how well tuned. Now maybe this "electric turbocharger " that Subaru is supposedly working on will solve that. But I think to get the response needed, it would require the electric motor to be spinning nearly constantly. And I worry the motor might overheat.
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