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Why would they have problems with the direct injection? The mazdaspeed 3 has direct injection and nobody is having issues with that. They all work the same way. I believe on the MS3 they make aftermarket injectors but you dont need them till you get to something like 450+whp if im not mistaken. Due to the fact that the injectors are such high pressure the flow capability of the injectors is very good.
Seems like that shop may not know what they are doing when it comes to DI tuning. I would almost bet that the factory injectors would probably have supported 324whp.
Seems like that shop may not know what they are doing when it comes to DI tuning. I would almost bet that the factory injectors would probably have supported 324whp.