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Is it throwing any codes? I would guess maybe the Cats were on the downward spiral for awhile if the prior tune was not on point. Higher HP boosted applications are tough on Cats regardless. Not much point in doing any more data logging for now. I would double check and review your tune with VMP...

Sounds like your Cat's are gone. How long has it been boosted?

depending upon your actual tire size...My guess is 4.10

Bought myself my favorite...Magnuson Supercharger, Fitiment Kit and Tune for my 5.7 Tundra. GT500 related? Tripple pass dual fan HE...