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I'm going catless secondaries. I don't have a flash tune to code out the CEL, and I dont want any smell. Sound is not a concern for me, bump in performance and no smell/CEL are my top priorities. I'm trying to improve my 60-130 and I've reached the cars current potential at 6.71 with stock downpipes and current state of mods.
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2018 M5 Singapore Grey CCBs/Utku Noa E45 ECU/xHP TCU/PG-Intake/PG-Lower Downpipes
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