I didn't say drill a hole in your cat. If you get the test kit, it has full instructions to drill a small hole in the pipe just ahead of the cat and read the pressure there after you install the special fitting.Yeah I already priced the ignition coil from Rock Auto... will order it tomorrow after work... Also Ravalli, Its kind of hard to trust the advise from someone who suggested to drill a hole in my muffler/cat converter...
THEN --- after the test, they provide a nice small screw to close it back up again.
MOST people own a drill ---- not too many people have the sensor socket nor know how to use it.
It was a suggestion to save you some money and even though you believe I told you to drill into the cat --- I did not.
BTW --- as a CARB/CalEPA Brake-Lamp-Emissions Inspector for over 50 years for the State of California and as an inspector-installer-adjuster and friend of the court --- that drill/screw kit is safe, legal and cheap.
I'm outta here --- listen to "people" with "lots of experience" and anecdotes ..... just do what you want......