downpipe w o2 spacers

Kimnation · 12-26-2023, 04:18 AM

has anyone had success avoiding a CEL by running o2 spacers with a catless downpipe? Looking to run a catless downpipe on a stock ecu and preferably with no check engine light.

cyam · 12-26-2023, 05:49 PM

Only a tune to ignore 2nd o2.

This has been done to death but on this engine if you change the dp to catless (or almost anything) you WILL GET A CEL end of story. Forget spacers.

12-26-2023, 04:18 AM	#1
Kimnation New Member 33 Rep 19 Posts Drives: G20 M440i, B9 Sq5 Join Date: Oct 2023 Location: San Diego iTrader: (0) Garage List 2023 Bmw M440i Rwd [8.17]	downpipe w o2 spacers has anyone had success avoiding a CEL by running o2 spacers with a catless downpipe? Looking to run a catless downpipe on a stock ecu and preferably with no check engine light.
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12-26-2023, 05:49 PM	#2
cyam Lieutenant 199 Rep 458 Posts Drives: BMW M340i X (2020 G20) Join Date: Apr 2022 Location: AU iTrader: (0)	Only a tune to ignore 2nd o2. This has been done to death but on this engine if you change the dp to catless (or almost anything) you WILL GET A CEL end of story. Forget spacers.
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