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Discussion Starter · #1 ·
I have a 2010 987.2 2.9l.
It has 4 x 400 cell cats ( 2 in each manifold)
I was thinking of removing the secondary cells after the O2 sensors which would leave just one 400 cell cat in each manifold.
The question is how much improvement will I see for a free upgrade vs installing an aftermarkel header with 200 cell cats for $$$

I will also be installing a Borla cat back that I have
 
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