Let me get this straight... he thinks 175k miles is actually something to write about? That should only be 1/3 the life-cycle of a modern passenger car if it's actually taken care properly.
The fact he said the Sante Fe needs a timing chain cover means he didn't REPLACE the timing chain at the required interval and it BROKE, trashing the cover.
Cats are a simple weld on job at any local muffler shop, less than $200 around here, including parts.
I have a 1978 Malibu I use for mail delivery and a daily driver. My nephew asked me how many miles on it, I asked him which part?
Engine was purchased rebuilt. I've put 65k on it. (Original engine went 340,000 miles)
Transmission was purchased used, no idea as to total miles, I've put 115,000 on it.
Car was purchased on E-bay needing an engine. Odometer said 127,000, I've put 115,000 more on it, for a total of 242,000.
The rear axle came out of my first car, which had the 340K motor. Currently has 405,000 miles.