I have a 2001 Montero limited that codes p0432 which indicates the primary cats are not working. There aren't any other 02 codes so its seems the sensors are OK.

Has anyone replaced this part and where did you get it? Rock auto has the cats in the y pipe for $277 while the mitsu places on line are around $600. I'd like to hear if anyone has used the cheaper parts and what their experience was. Thanks!