I noticed that the exhaust slightly burned the bumper paint at the tips on my 6.0. I think his happened while idling during inspection. What concerns me though, is the paint is more discolored on one side.

When I checked the temperature it showed that one side was about 320F and the other about 260F.

Using the same infrared gun, I shot the individual header tubes at the heads and didn't find one hot cylinder. The whole left bank was hotter.

I'm hoping new O2 sensors will make the both sides even.

Can anyone tell me what temperature might be normal?

I used an infrared gun.
I have a Quicksilver system with silencers to replace the secondary cats. And the stock primary cats are in place.

Thanks,
Frank