Fumes galore?
 

I have a 2006 F250 Diesel with 117000 kms on it.Just lately it started to become overwhelming.I had someone look for exhaust leaks and told me everything looked fine?Can anyone tell me whats going on???Thanks John

Simple things like a restricted air filter could do it.
If it has a turbo , that might not be working correctly.
Both of the above usually come with some type of low power complaint.

Thanks Hanky I'll start with replacing the air filter!