Neat info about catalytic converters

[Beatty, Robert]

Researching things for my new exhaust I am designing for my 5ktq and saw
this.  Rather good info about how a cat works exactly.

http://www.howstuffworks.com/catalytic-converter.htm

While im posting I'll also ask this question.  From a performance
standpoint, is there an optimal backpressure that is desired with the MC
motor and higher boost?  Currently using a K-26, but would like to change to
the K-24 at some point in the future.

Rob