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      12-09-2012, 09:29 PM   #3
parky1215
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Drives: Lucy, F80 M3
Join Date: Nov 2010
Location: Claremont, CA

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Quote:
Originally Posted by nitehawk View Post
Hmm, what's the cell density of the stock secondary cats?
Dont have exact cell count but it is high.
I wasnt able to see anything when looking through stock mid cat.

Reason why I initially installed these hfc together with catless downpipe is because giac told me that i would notice about 20-30 hp difference with their tune if i have stock secondary cats vs not having them at all or replace with hfc.