How can you tell if you have a bad cat? (NO 4 LEGGED JOKES PLEASE)

Anyone ever hear of a product called Toluline?
I was told to put a gallon in the fuel tank and it will break up all the carbon and clean the injectors, only problem is all the crap goes out the exhaust and into the cat.

I've never heard of the stuff, but I'm always leary of trying the "mechanic in a bottle" fixes.

Toluene? It is a solvent, can be found at places like Sherwin-Williams. It'* a popular octane booster as well.

Your best bet would be to get the exhaust back pressure tested before and after you add it to see if it affected your cat.

Toluene will have no effect, neither positive nor negative on your cat. It can have the effect of keeping your injectors clean, but only if you run it often.

I'm Mr. Toluene.

By your reply I can be confident that you use it and have not found a problem with its use.
Do you think it is an option to use for a motor with 110,000mi?

It'* of no real benefit to you. Running higher octane is only a benefit if you're getting KR from high boost. Stick with off-the-shelf fuel injector cleaners (additives). Toluene is quite expensive, and I don't know it'* effect on your plastic upper intake manifold long-term. Supercharged cars have no problem injesting it though.