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Discussion Starter · #1 ·
So I got around to sorting my new manifold and I noticed that the stock mani has a much deeper boss for the pre-cat O2 sensor than the new one. On the new mani, both the pre-cat bosses are shallow enough to let the entire sensor head stick out into the flow, which I’m sure I read somewhere is a Bad Thing.

Should I be adding a spacer here, both for the narrowband sensor and for the wideband that I’ll eventually fit?








 

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Premium Member
2005 R53, 2005 R53 lightweight, 2008 R55S, 2012 R58FJCW, 2014 R60SD All4, 1996 Mini Cooper 35SE.
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6,637 Posts
a wideband sensor would be vulnerable, they need a 1" bung.
 

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Premium Member
2005 R53, 2005 R53 lightweight, 2008 R55S, 2012 R58FJCW, 2014 R60SD All4, 1996 Mini Cooper 35SE.
Joined
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6,637 Posts
I have 1/2" in my aftermarket manifold for the stock sensor fwiw, but the stock pipe is 1" pre-cat and 1/4" perhaps post cat or thereabouts, other aftermarket pipes seem to vary,
 

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That's you, that is.
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310 Posts
Discussion Starter · #5 ·
Both bungs in the scorpion are 1/4 inch, so should I buy a 3/4” spacer for the stock pre-cat sensor to make it the same as the stock manifold or leave it as-is?
 
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