If it tuned or not doesn't matter: A VR6 has injectors more than big enough for its NA output,. Some people even run low boost on them. The reason I asked what your goal is this: If your going forced induction and need more fuel, then fine, as who ever is tuning it can build this into your tune. That being said, you will be better off with larger injectors. If you think that you need more fuel and your engine is NA, your wrong AND the ECU will work around this with no power gain. It works like this. In normal closed loop lambda regulation the ECU calculates a lambda correction factor, If you p