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Only the BMW dealership has told me its related to the cats. The other places know its not the cats.
So many BMW's worldwide have been decat'ed and dont have this problem, which means the flat spot isn't caused by the decat. If it was, then the flat spot would happen anywhere in the rev range instead of only between 2500rpm and 3500rpm.
Some of the tuners reckon its electronic related because its only in that same small rev range all the time for the flat spot. They said if it was mechanical then the flat spot would happen anywhere in the rev range.
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BMW dealerships diagnostics only works with oem configurations on the car. Their machine will obviously detect it being the cats because its not oem factory spec anymore
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F20 M135i LCi
Ex: E81 130i
Ex: E87 130i
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