How do you no it is running too rich? Your post is very lacking in details. Is the Check Engine Light on? It should be. Did you connect a professional grade Scan Tool and check for Diagnostic Trouble Codes? The electronics provide the clues.
For an RSX of they age it will have been raced and thrashed.
White Smoke is steam.
Blue Smoke is oil.
Black Smoke is too rich.
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SOURCE: 05 acura tl had both heads replaced and the rear bank is running very rich
since you have a cherry red catalyst surely you have a clogged cat and if you do emission test surely is going to indicate the catalyst. now if the one of the cylinder heads is running rich just confirm whether you have any injector with a malfunction and instead spraying the fuel is pouring the fuel and cause fuel to go through exhaust not burnt and possible that is the reason which damaged the cat.
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