This add on kit for BMW N54 engines allows your JB4 to "2step" the engine
This add on kit for BMW N54 engines allows your JB4 to "2step" the engine
Plug & play power — gain up to 40 horsepower in under one minute! 50 state legal performance!
CARB Approved - Legal in All 50 States! CARB certified for sale in all 50 states
Instant boost!
Replacement JB4 OBDII cable suitable for use in all applications where the JB4 attaches to the OBDII port under the dash. Includes JB4 side repair harness molex pigtail.
Increase performance without sacrificing reliability
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
07-18-2026