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The G codes are for the turbo engines. That being said, from everything I'm reading now everyone is saying that the BB codes are better performance wise than the G codes.
Ask him what the pop pressure specs are. 1450-1500 are for N/A, 1900-2000 are for turbos. Relative timing makes a difference. Get BB code injectors if you are N/A or turboed. They are supposed to be the best for both situations.
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