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No, you cannot use larger injectors without changing the chip. There is no way for the stock chip to know that you are using larger injectors so it will use the same duty cycle that it uses for the stock injectors, causing you to run very rich at idle and off-boost, as well as running rich on-boost if you are running stock boost levels.
You need to have the chip matched to the injectors.
EDIT: Also, unless you are saturating the stock injectors (usually doesn't happen until 275-300 RWHP) you really won't see any benefit to larger injectors. They need to be matched to the chip and to boost levels.
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