No, it is not ok. If he wants to use an SAFC, which is not recommended, then he has to get all the proper monitoring devices in order to ensure that he has the SAFC set perfectly for his setup. It makes absolutely no sense to buy injectors for the stock turbo first of all, then secondly it makes no sense to get an SAFC if he's not going to actually tune the car. The only reason to have an SAFC is so that you can tune yourself, and even that isn't a good use, because you can already do that FOR FREE with EcuFlash, and EcuFlash has 100 times the capabilities of an SAFC.
If he is going to take this route instead of getting a proper tune, he must ensure that he has a wideband o2 and a datalogger, then he needs to follow our SAFC tuning guide in the tech section to ensure that he gets both his low throttle and high throttle settings tuned for those injectors.
If he really wants the cheapest and most effective solution, he should not get the injectors (or sell them if he already has them), not get the SAFC (or sell it if he already has it), then get flashed for $200 or so.
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