I used two cans of GTP by CRC and still failed and i did exactly like they said to do on the cartons. I even replaced the gas cap as i know that is a hangup. I'll check with the locally owned muffler shop and see waht they want for a generic Cat. I can buy them pretty cheap on the net, but finding a muffler shop to install them might be a problem as they'd want the cat sales too. I really don't blame them, I would too if I were in that business.

My observation is that without the GTP my readings would have been sky high, So I guess the cat's shot.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.