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JB4 for BMW GEN3 B48/B58Power gains of up to 130WHP on a stock vehicle without the risks of flashing! The JB4 is the most advanced and highly featured tuning system available for your B48 B58 GEN3 powered vehicle. Power gains are up to 100whp to the wheels (125hp crank) on a completely stock car on 93 octane, and even higher with ethanol fuel mixed in! This new JB4 BMW tuner is specifically designed for the latest Gen 3 B48 B58 variant and is capable of processing the new

These new turbocharged Toyota motors are amazing

all from the palm of your hand

and away from the intercooler

• 2023+ S68 G70 BMW 7 Series M60e 4

** IMPORTANT: Do NOT attempt to run this kit in line with our Stage 2 kit

This unique plug and play kit replaces your factory coolant to trans fluid heat exchanger with a high-capacity fender-mounted air to trans fluid radiator

• Replaces your restrictive factory intake system

18MM and 20mm spacers might require slight inner fender rolling on the rear of some BMW E chassis vehicles

Wider Stance = Better Handling & More Aggressive Looks

Premium kit with billet fittings also includes everything you need for a plug and play installation but uses the our custom billet fittings and a billet elbow to make the connections

The JB4 is a plug and play performance tuner that attaches to two easy to access sensors in the engine bay and works with your factory DME tuning to remap your boost

VWI GLI JB1 Install and Demo video

Exchange/Return Notes