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A bolt-on tuning bundle for G2x BMWs with the B46/B48 2.0T engine, built around the JB4 piggyback tuner. JB4 adds boost and fuel control through the factory ECU connectors without flashing it, so the car can be returned to stock. The package targets roughly 350 hp on pump gas and suits 230i, 330i, 430i and 330e owners who want more power and keep a warranty-friendly path. Compared with a bench flash, it gives less fine control over timing and torque limits, but it installs at home and is easy to remove.
In stockReturn policy
Availability unknown
Lowest price we've seen: $999.00 on Nov 13 at Burger Motorsports. Tracked across 1 store since Nov 13.
Owners of B46/B48 cars report strong mid-range and top-end gains from the JB4, with easy map changes through the app. Complaints center on install fiddliness and the need for good fuel.
This is a bolt-on tuning package for BMW B46/B48 2.0T engines in the G2x and G4x chassis, including the 230i, 330i and 430i. It is built to deliver over 350HP on a locked ECU. Installation is plug-and-play and requires no permanent modifications.
The JB4 tuner allows wireless, on-the-fly power adjustments and data logging. It connects through the included JB4PRO Bluetooth Adapter and free app. The package also adds an upgraded cold air intake for better airflow and an oil catch can. It lets the driver know the exact ethanol content at all times.
