JB4 Tuner for Audi A3 8V FWD, A4 B9, A5 B9 (190HP 2.0T)- Burger TuningAudi GEN 3B A3 8V, A4 B9, A5 B9 Performance Tuner The JB4 is a plug and play Audi tuner that plugs into easy access sensors in the engine bay The JB4 is a plug and play Audi tuner that plugs into easy access sensors in the engine bay and works with your factory ECU tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. It features a 64mhz processor allowing sensors to be sampled 800 times per second using