It makes sense... when you beat the you know what out of your car, your headers glow cherry red. The whole point of a cat is to act like an afterburner for raw emissions comming out the pipe. If your headers are cherry red they are burning the acces Hydrocarbon out of the exhaust gas just like the cat would be doing, but mr. exhaust gas analizer dont need to know that. It is defenatly feesible.
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Kris @ Tech9
86' 930/GT-40R Sold 
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
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