What are the limits of the Cobra’s stock fuel system?
Generally the practical limits of the stock fuel system is 490-510rwhp. Each car may be different. At that level you usually max out both the MAF and the fuel pump. It is very common to see the stock meter max out in the 485-500rwhp area. So a BAP (Boost-A-Pump) or higher capacity pumps (ie. Ford GT or Aviator) are required, along with either a MAFia, MAFXtender or BA2400 meter upgrade, at that power level. The stock fuel injectors will reach the upper end of the duty cycle usually in the 510-525rwhp area, but read the additional information below. Your tuner can help you in this area. Also consider upgrading the injectors when they near the maximum recommended 75-80% duty cycle. While the stock injectors might be fine for a setup making, say, 505rwhp (with ported blower), going with larger injectors allows the fuel system to work more easily and produce less heat. It is recommended that you keep the injector duty cycle at a maximum of 75-80%. This will insure less heat and longer inje
