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Engine/Power - EJ20T (pre-2006 WRX and JDM)There is replacement for displacement, it is forced induction - OEM 2.0 liter turbo engines in the USDM WRX. 90-94 Legacy Turbo EJ22 turbo engines can also be discussed here.
Will changing the uppipe up boost levels? The reason I am asking this is because if it does do I need the utec does that mean I wouldn't be able to drive my car without the utec cus of dangerously high boost?
No to everything you just said. Your boost level is determined by your factory boost controller, the spool time is decreased with a new up-pipe, not the boost setting.