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Discussion Starter · #1 ·
Hello Subi Fan,

I am doing my exhaust from cat back to the Y pipe. The front cat 3 nuts on the flange. What size are those?
Does anyone know? Any help I greatly appreciated.
 

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2008 OB Limited 2.5i, Portland OR USA
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8,086 Posts
Model and year would help a lot, but offhand I'd make an educated guess of 13 mm.
 

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2011 Outback Limited 2.5i/2018 Crosstrek limited
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5,013 Posts
My CAT is neutered…oh, never mind.
 
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