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AEM X-Series Wideband UEGO AFR Sensor Controller Gauge Air Filters - Drop In Cobb 22-24 Subaru WRX AluminumFaster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune. AEM's Wideband Controllers with X Digital technology can reduce deadtime and improve the performance of your vehicle through more accurate AFR tuning. Deadtime is the delay between when exhaust gas composition changes and when that change is reported by the O2 sensor. While flow of exhaust gases can affect deadtime, it is not the only