I have seen custom built exhausts for diesels with a pure stainless element inside. So there is no blow out of the baffles.

They are clamped in or welded.

Also, you can decrease on the soot by adding a propane kit. This type of system will add about 50 more horses and also increase fuel economy by some 15% or more.

Most diesels do not burn 25% of the fuel.

Another thing you can do is buying a performance injector system. Like a variable pattern spray injector. Most injectors have a fixed pattern. You want one which changes as the motor is firing. You will need to have the injection tuned as well to fire correctly.

Thanks