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[edc]

Originally Posted by NewArt

The only 200 cell secondarycats that I see on e-bay are the Circuit Werks brand at around $400 or so. Are you referring to these?

Circuit Werks isn't a known name here so it's not these. Search eBay UK for a comparison. There are a couple of retailers here that sell the mid/secondary pipe with cat. My old ones with 100 cell cats eventually failed the emissions so I have reverted back to the standard ones until I get a new car core welded back in.

If the straight mid pipes are cheap enough there's no reason why you couldn't modify those to insert a cat and copy the shape of the ones with the cat already in.