the difference among all the cats are very minimal, if at all any; however different manufactures use different cell-count cats. Stillen doesn't advertise what theres is but it's a relatively simple concept. More cells = quieter, less gas smell, but a bit more restrictive. On the other hand less cells is the opposite. Louder, more gas smell, better flow.
I know Berk Tech, as well as us (AAM Comp) uses 200 cell count, FI uses 300 cell count
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