![]() For JB4 data log analysis and advanced tuning advice post your JB4 logs, vehicle info, modifications, fuel used, and any other relevant details to our support forum staffed by professional tuners. ![]() F40 Model Year: 2019 + Previous Generations. ![]() N55 Downpipe Install guide? Login Register.Assuming the car starts and idles without a CEL reinstall the cowl/HVAC cover and installation is complete. problems take photos of the install and email to for troubleshooting support. JB N55 E Series Stage 1 and JB4 Install Guide.The tuner installs between your car's sensors and it's ECU (Computer) and manipulates how the car runs via these connections. We recommend it as the starting place for all those new to modifying their car and those who plan to continue. The JB4 is a plug and play tune for your turbocharged BMW.
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