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I have my 2011 E92 M3 installed the Akrapovic full exhaust and add a "delete -R" since Oct.2011. Everything is fine except I encountered many time of Check engine light on and the car reduced the power from yesterday. I have to pull over then restart the engine then it back to normal. I brought it to dealer, but they can not find any problem via computer. Is that because the delete-R broke? Can anyone give me some help? Thanks
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