You never posted the emissions test results...

...you may not have needed a new cat after all...a clogged EGR tube will also cause a failed emissions test...my culprit last year.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car