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Rough idle in sports+
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02-11-2017, 05:48 PM
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d0scas
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Drives: 08' 135i 16' M2
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I had this as well when I had my downpipe installed, I just didn't think much of it because I was untuned with the catless downpipe in, but I have no idea if it has done any damage that will present in the future
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