Try running the car for a little while when it's getting dark out. Then get out and look under your car. If the cat's glowing, it's more than likely plugged, or severely restricted.
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*TOTALED* - 2000 Olds Alero Sedan - 3.4L 3400 V6 - WAI - Sony Head Unit -
NEW RIDE - 2005 Buick LaCrosse - 3.8L 3800 Series III V6 - WAI - Muffler/Resonator removed -
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