I burned up my one of my cats and replaced them with Magna Flow cats. The size of the Magna Flow cats are a lot bigger than the stock ones. Magna flow makes different size cats, so I went with the largest one I could fit. They are CARB certified as a replacement for the 6.0 engine.
I don't know if my stock cats were blocked but after I replaced them the performance gain was awesome, and sounds way better.
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03 H2 Sunset Orange Magna Charger w headers & cold air intake, 4\" Rancho lift, XTC Light Bars Front & Rear, 4.56 gears with Eaton Front Locker
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