gutting the cat

[Gumby 1100_imp]

Hm. My ears were burning.

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Good, then maybe you can answer this?:

I can see from your photos that the CAT honeycomb material is the full diameter of the collector tube, but approximately how long is it?

Is it short enough that you could maybe hog it out (or just open it up significantly) with a long drill bit from the outlet of the collector tube, or is there too much offset in the outlet tube to do that?

I don't want to take work away from you, but shipping my header to you and back from Canada would be very expensive.
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Post Edit: I guess I should have re-read your old post that I provided the link for!

The CAT material was almost as long as the collector tube so hogging it out from the small end of the offset outlet tube would be practically impossible, hence your modification method.