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The gas engine catalysts I work with are rated to a steady state working temperature of 950C, and the exhaust gas itself is almost always higher...so if that tells you anything...
I messed around with cruise AFR and timing to try and get it down and never made much progress going through a big range of values. Sensor package really wasnt good enough to do WOT testing with that. 18 or so degrees of timing at 11-11.5 AFR.
Has anyone here ran twin borg warner efr turbos? It looks like agp makes a kit for an gen 5 Camaro with those, they may be worth talking to just to get an idea.