You have a Power FC, you can adjust injector sizing on your commander and go drive around.
Formula = stock 370cc divided by 550cc = 0.67cc x 100 = 67.0%. Adjust injectors 1-4 to match 67%
Google your specific injector to find the latency.
Adjust MAF settings accordingly. Then be easy on your motor. Apexi thought ahead about their products and realized there are quite a bit of people out there who can't get a tune the day they install the ECU. Stock Power F/C tune runs on the rich side and pulls timing. Pretty safe stuff.
Oh ya, turn your O-2 sensor reading on in the Settings menu if you're using it.
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