I just called the mechanic; #3 cylinder is taking in water!
He explained that the water comng through the exhaust is causing the cat. to glow red hot. Wierd thing is, as far as I know, the engine never overheated! I don't ever recall seeing a red light, or any warning signs of the engine getting too hot.
Is this common or is my mechanic trying to sell a new engine? He says you can't do a normal head repair as these engines are "baked?" What does that mean?