We replaced the whole exhaust system in addition to the cats with Walkers. Not sure if that is considered junk. The OEM were no longer available from Ford.Were the new cats some no name junk, or quality cats from a reputable manufacturer? 98% of the cost of cats in in the BIG $$$ Platinum, Palladium and Rhodium metals on the honeycomb. Cheapo cats skimp on the metals resulting in premature failure. This assumes the cause of the original failure was fixed as sheila said.