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Well I can't speak on behalf of catted DP's, but I have the AR Catless and it throws a code at least every other day, but I have auto clear on, so I never see them.
If you are in good with them, they should understand that, but then again, it's all what you feel like chancing.
I am in very good with my dealer here in Germany, they love the sound of the car, but I am sure if it messed something up, and it was my fault, I'd most likely pay for it.
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Sold  2011 BMW 135i - COBB V2 AP / VMR 710's / 4" AR Catless DP / BMS Intake w/ Air Scoops / Eibach Pro Kit / MadDad Street Series Axle Back / ER Charge Pipe / BMS OCC / Vorshlag Camber Plates / Sammich Sticker |