Fuel-It S55 BMW (CPI) Charge Pipe Injection KitFuel It S55 BMW (CPI) Charge Pipe Injection Kit Advancements of S55 flash tuning and JB4 back end flash maps have removed the software fuel limits but created a new limiting factor, high fuel pressure pump volume. With higher boost targets and E85 fuel mixtures, the high pressure pump is not able to keep up with demand resulting in fuel pressure drops that trigger engine misfires, stuttering, and limit your overall performance. The Fuel IT S55 CPI kit
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