JB4 Tuner for 2021+ Toyota GR Yaris & GR Corolla 3cyl - Burger TuningPower gains of up to 50whp and 60wtq to the wheels on a stock vehicle without the risks associated with flashing! 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, 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 dedicated 10 bit