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I've been running a catless downpipe and JB4 for about two months now and did not receive CEL, although I did get codes once or twice on the JB4 "catless downpipe detected"
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2014 Black Sapphire Metallic F32 428i xDrive M Sport | Gloss Black Striped Dual Slat Kidney Grills | CF M4 Style Mirror Caps | CF M4 Style Trunk Spoiler | CF Rear Diffuser | Rohana RFX5 Gloss Gold 20" | CF Wrapped Interior | BM3 Stage 2 93 Agg Tune | VRSF Catless Downpipe | Evolution Racewerks Chargepipe | Pheonix Racing Intercooler | K&N Drop In Filter|
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