Air Fuel Ratio gauges are a must have for any turbocharged vehicle. Air Fuel gauges provide the driver key information whether your turbocharged Subaru is running lean or rich. Tuners utilize these gauges to dial in your vehicles tune making sure your air fuel ratios are 100% spot on. If your experiencing 13:1 at peak boost you are running extremely lean and could lead to engine failure, or if your running below 10:1 then you are extremely rich which you could run the risk of washing a cylinder.

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