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Only two guaranteed to fall within the oem o2 delta is the Fabspeed catted downpipe, and the HJS 300 cell dp, which is what is used in the Fabspeed product. Performance gains with any of them will be around the same, until a tune is added. Then that varies even more between the PWG and EWG turbos of the N55.
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F30 335iX | Remus Axleback | Fabspeed Catted DP | VRSF Comp IC | 18X9 ET35 19lb MT1 | 255/40/18 ECS | Ohlins RT Millway Street | Millway Control Arm Bushings | Turner Endlinks | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
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