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The front cats are pre-cats, the rear is the main cat. Universal replacement cats will replace the rear and are rated to also replace the front at the same time. So if you are concerned about the fronts not working just replace the rear with a universal. If the fronts aren't plugged just leave them in place or gut them.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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