i ran it for a couple months off and on with stock cats, i dont think it will harm them unless you run it full time for a long time.
MPG drops quite a bit, i was running 16-17mpg with it for a while, i said fuggit, not worth it since as said, it doesnt offer any performance value.
AED offers the cam tune also
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2011 Mustang GT - Sterling Grey - stockish
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