Im deciding to buy air/fuel ratio gauge and im a noob and i dont know what the difference between wide and narrow besides the price different whats the difference? i have a 02 wrx stage2 thanks solomon
narrow band is only designed to monitor a very small (narrow) air fuel range something like 13-15 AFR. a wideband will read a much larger range something like 8-20 AFR. since IIRC you want to be around 11-11.5 AFR while under boost a narrow band wont help you much.