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Is it periodic or not? I have experienced something similar - also without the JB4 installed. I think its just harder for the car to get the AFR spot on without the original downpipe - hence it fluctuates more on the AFR. You can easily see it using e.g. the Torque app.
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M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost
(A Dane in China)  |