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Trying not to sound like a total ass here but a bunch of guys making suggestions and trying to justify their opinions about the pollution increases from their mods is not what I would consider informed.
There is lots of peer reviewed and published research on pollution and managing cat temp. Carmakers also spend millions on fuel economy and meeting EPA targets. That is well informed info. Unfortunately much of what is known is proprietary and specific to a platform.
If you would like to do some of your own study then install an egt probe in the cat. Sadly 5 gas analyzers are expensive. I paid almost 5k for mine. This is going to be a good solid feedback source as to how you are really doing. Without this stuff you may as well be shooting in the dark and theorizing about if you hit the target or not.
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