I got paid to do it to! The changes are minor, and the filth that was removed was far easier to see in the bucket that rinsed out the old t-shirt cloth I used with a healthy anount of 409.
This original owner (doofus) had removed the factory air years ago, but not all the hoses, which were just cluttering up the passenger side, the ignition wires were a mess, and most of the black paint you see is the work of a doofus with a spray paint can and no clue. Yup, sprayed the black over the valve covers, air filter housing, etc etc, without cleaning off the filth that was on them. Threw away the factory air system parts he removed.