i've hade 3 after market cats on my truck. i keep changing the exaust due to trail damage. anyway all of them passed smog better than the two factory cats with 130k miles on them. catco, magnaflow both make quality parts.
that said DONT change the cats. replace the O2 sensor. only the after cat one needs to be replaced. and do it SOON. the longer you drive it with that code the more it wears out the cat.
that said DONT change the cats. replace the O2 sensor. only the after cat one needs to be replaced. and do it SOON. the longer you drive it with that code the more it wears out the cat.
