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      06-07-2011, 10:14 AM   #20
Kamal
Indian Stig
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Drives: '03 540i M, '11 Ducati M796
Join Date: May 2008
Location: StL/CoMO

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Garage List
2008 BMW 135i  [7.56]
2011 BMW 328i  [8.00]
Quote:
Originally Posted by bogart View Post
What is an O2 spacer?
I believe it just spaces the sensor so that it isn't directly in the flow the exhaust gas. On my previous ride (Honda S2k) people, including myself, would run test pipes in place of the cat with "built-in CEL fixes," which basically just prevented the sensor from being inserted completely into the pipe.

I'd like to know who sells these spacers and the advantages/disadvantages of using them.
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