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Originally Posted by HootisTigglebits
Has anyone done this successfully on a 2017 M240i? My state just checks the computer to see if there’s any trouble codes set and that the system is ready. Since I have a catless downpipe my catalyst system and downstream O2 system just says “unready”. Figured I’d see if this actually works or if I need to put my cat back on.
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What I am doing with my catless F80 is keeping my stock downpipe and swapping back to the stock downpipe and flashing to a stock tune. There's also some places that will generally pass you as cash is king. For my M240 to evade the emissions issue since I don't want the headache of that process I am going with a high flow cat, I can still get to stage 2+ but depending on what you're reaching for the Hi flow cat may be restrictive? You are able to put a spacer but finding a shop willing to do it is hit or miss and doing it the right way yourself as someone said is also hit or miss, but it wouldn't hurt to try it is possible.