While "OLD" news in my book! Tis has been going on for the last 40 years I've been driving diesel rigs of ALL sorts. Even in gas rigs this is going on.
Honda recently decided to quit manufacturing gas mowers for the residential/commercial market because of emission laws going into effect. Tiy can still get a generator/weed eater/ or equal gas 4 stroke from them. No! lawn mowers anymore!
I've been running commercial Honda 21" walk behinds for 30 some odd years!
Also, why pickups have cats and equal on the diesel engines etc. just like gaz pickups etc. Then again, if my Navistar has a blow out of its IDI 7.3......not sure what I would replace it with......might stick with it, as its old enough I at this point in time, do not have to upgrade the emissions part of it. I'm sure it will not meet current standards.
It only took me 5 or 6 times to remember how to make the link a clicky! That is the only edit I did to NamMedics post.
Marty