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I'm running a defouler on my AR downpipe, and it doesn't keep the CEL off; however, it does help create about a 100 mile range where the sensor will not be triggered. I've been able to unflash and take my car in for service, with the downpipe installed.
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2011 135i Coupé / Cobb Stage 2 Sport / AR Design 4" Hi-Flo Catless Downpipes / Evolution Racewerks Charge Pipe / BMW Performance Exhaust / BMW N55 Mid-Pipes / BMW LCI "Black-Lines" / BMW Black Kidney Grilles / Carbon Fiber Diffuser / 35% Tint
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