steve I ran the test with the car hot. I ran 2000 rpms for 2-3 minutes like all the tests say to do. I will run it longer but even after driving the outlet is not anywhere close to the temp in the front. Just touching the front burns but UI can wrap my hand around the outlet. its just warm. I even touched the cat itself in front and back. Very noticable difference.
Thanks for the help. I dont have a vaccum gauge to check it with.
Hopefully it is the cat. I would hate to throw out $300.
I dont have an infrared gun so I have to use my hands but if after 10 minutes its still not cold back there?
Plus my exhaust pipes have very little pressure back there

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1993 Benz-190E-2.6 liter