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I'm in the same boat, I'd like to enjoy the weight savings of a header and run the standard honda converter behind the engine in it's typical position. I think it was placed on the front of the engine to heat up sooner for lower emission. Aside from the hotter converter doing a better job at "cleaning" the exhaust, I think heat held in the engine is a bad thing.
The 92-95 VX and CX have the front mounted cat. The DX, LX, EX, and Si have the standard cat behind the engine. In 96-00 the DX has the front mounted cat, not sure about the others.
I've found the front mounted cat to be restrictive and have always switched my cars to the regular manifold or header with the standard cat instead, without noticing any substantial delay in warm up or increase in warm up stink. My experimentation with lean burn is yet to come though, but on it's way.
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