Not boosted, but I have the AEM Failsafe (does boost/wideband) and uses the Bosch 4.9. Not many miles but seems pretty accurate so far and have had positive experiences using AEM AFR gauges in my past boosted vehicles (R32 Skyline GTS-t, MK3 Supra & S14 Silvia). If you're not an AEM fan, I know that Tanabe uses the 4.9 with their Revel VLS wideband.
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