While we have found that this device works very well with the stock fuel system to retain good air/fuel ratios when boost levels are raised, the factory fuel system does have a limit and can only support so much boost/HP. The peak boost cut limit is almost completely removed with this modification so there will be no safeguard against overboost. You must closely monitor your air/fuel ratio and boost levels upon installation of this device to ensure that you are operating the engine in the safe running zone.