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Shane beat us to the punch...
We did extensive testing upon development of our BMW downpipes. It now seems that a few vehicles are experiencing check engine lights due to a slow response speed from the O2 sensor. We incorporated an O2 sensor spacer which has proven to be extremely effective on many other vehicles that are known to be sensitive (ie: many Ferrari models). Unfortunately, it seems to be overkill for a select few of these BMWs. All of our BMW downpipes from here on out will not incorporate these O2 sensor spacers, as the HJS cats are doing the job superbly on their own.
To be clear the issue is not with the catalysts themselves. HJS catalyst cores are top-notch quality (German engineering and manufacturing) and are well suited for the job; we wanted to use the best for reliability and performance. We're the second largest purchaser of HJS catalysts in the world and we're proud to equip our BMW Sport Cats with them.
We apologize for any inconvenience and will push our engineering division further upon development to try and isolate any issues while pushing performance to the absolute max. If you are experiencing a check engine light, specifically P031F code, please let us know. We will replace your Sport Cat Downpipes under warranty and get you taken care of. Please contact us if you experience any issues.
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