Consistent ignition energy is vital when tuning the G16E-GTS engine for higher boost levels. As you push your GR Yaris on the track, the factory ignition system can struggle under increased cylinder pressures. Ensure perfectly clean combustion and maximum power delivery by maintaining your system with Genuine Toyota Coil Packs. To easily manipulate factory boost limits and unlock hidden horsepower without permanent ECU modifications, install the highly effective plug-and-play HKS Power Editor.