Putting a high flow low restriction muffler on a mechanical diesel

Very true with a snowmobile.
Change the pipe to high flow you need to add fuel or it will go lean and melt a piston.
A diesel though is much different.
The only way to increase air flow is a bigger turbo.
Change to a less restricted exhaust on your mechanical diesel will most likely lower your exhaust temperature slightly and give a slightly better fuel mileage.
There is zero chance you will cause engine damage on a diesel by just changing to a high flow exhaust.

 

People do it all the time.

I put a hi flow on the 05 w900 I was driving. Little better on fuel. It was practically hollow.

When I had the computer erased and reloaded with nothing governed or passwords. That made a BIG improvement in power and economy.

 

I never noticed much difference in coolant temps at all.
I run a straight pipe on my 14 liter Detroit.

 

Through your old flashlight batteries down the stack for awhile and you will figure it out without spending money. It has been a long time but some guys went back to short mufflers after straights. Said they ran better with a little restriction. Lots of different engines and combinations out there. They would not all be the same.
See lots of big pipes anymore. Wonder how they would test on a dyno in comparison.

 

Acid eats the baffles out. Or so I was told.