BMW B58 Gen 1 Charge Pipe Injection Kit (CPI) - Fuel ItIntroducing our new BMW B58 Gen 1 specific charge pipe injector (CPI) kit Advancements of B58 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