Aftermarket cats have always been junk. Its just with OBDII, the computer tests them and tells you they are junk.

When all a cat needed to do was take the exhaust down the line, aftermarket did the job. Take a look at any of them, compare to an OEM, weigh them. It doesn't take a research scientist to see the difference. Like many things, one gets what one pays for.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician