Practically all diesels have turbos. You have literally have to go back to tiny tractor engines form
The 60s to
Find ones that aren’t. Turbos already provide a ton of back pressure. What’s downstream of that is pretty irrelevant
My tractor from the early 00s doesn't have a turbo. Plenty of VW and Mercedes Benz cars built in the 80s and 90s don't have turbos.
Backpressure aft of the turbo is something you really want to avoid because it makes the turbine much less effective. The whole point is to use a pressure and thermal gradient to do work.
