05-18-2023, 08:07 PM | #1 |
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Using an o2 spacer to pass emmisions
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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2017 M240i - Estoril Blue
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05-21-2023, 03:17 PM | #2 | |
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Drives: 2017 m240i, 2015 X3 x35i
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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05-21-2023, 04:07 PM | #3 | |
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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. |
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05-22-2023, 07:42 AM | #4 |
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I would never try to cheat emissions, but IF I DID, I would have installed this:
https://www.fortluft.com/fortluft-o2...ler-90-degree/ A "friend" verified they never remove their DP back to stock now and never throw CEL. Just remove the tune back to stock, verify with OBD monitor, and go in for the inspection. That particular 90° defouler is OOS, but there is enough room for the straight bung. Probably well worth the hassle of changing DP every year |
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