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I was so disillusioned with the EFI I was just going to go with a 41mm FCR on my project motor.
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You still have ignition to deal with though.
The piggyback units can only add fuel, but since the OEM maps are generally lean, and it will now be a 550, this should not be a problem. Really, to do it right requires a wide band O2 sensor and AFR meter.