How do car repair shops bill for services?

My dealership posts an hourly labour rate of $145, but the actual rate to service the brakes on my 2019 Toyota Camry hybrid equates to $173. I am wondering if…

Should you buy an original or aftermarket catalytic convertor? 

I’m the owner of a 2002 Volkswagen Beetle showing just 112,000 km on the odometer. The catalytic convertor needs to be replaced because it’s rusted out (no, it wasn’t stolen!).…