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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > O2 sensor relocation

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      06-14-2012, 04:08 PM   #1
Drives: 335i LCI
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O2 sensor relocation


has anyone relocated the O2 sensors behind the secondary cats?

My premise is: the further away the cat is from the turbos, the less restrictive it is due to pressure drop - is this true?

If my premise is correct, then it is more beneficial to get catless DPs and relocate the O2 sensors, rather than get catted DPs and cut out the secondary cats.

So... is anyone running relocated O2 sensors with catless DPs and not throwing a code...?
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