Another one here who knows nothing about diesels and even less about 90s, but I remember the old days trying to get more power out of our Mini and my MG Midget engine. What I learned was that engines breathe. Like you and I we suck air in, the lungs processes part of it and we exhale what we don't use (which includes a lot of oxygen and other gasses that we breathed in in the first place).
Mixing fuel with air is a complicated business to get it right across the rev ranges and load conditions we put on an engine. Messing with that carefully balanced process is only going to screw up tens of years of R&D.
On petrol engines it was easy to increase the power of an engine by increasing the amount of fuel/air mix, simply add another choke to your carburetor. Meaning, if you had a single choke carb, remove it and put on a twin choke. We had three chokes on the 1071 mini we used to rally, two Reece-fish cross flow twins with the end choke blanked off using 3 out of the 4 chokes.
That on a standard engine may improve things but only increasing the ability to inhale doesn't make the runner go faster does it? You have to make the burning process more efficient too. So you increase compression ratios, you open up the intake ports and valves, then you start looking at breathing out.
Ours had a stage 2 head, higher lift cams, bigger valves, polished ports... LCB headers, larger diameter zorst, but any one of these things on their own is no use.
Dragsters have been using blowers since the ICE was invented (almost) but on its own a blower will do almost nothing without other mods to match it.
Modern engines are of course finely balanced to give an optimum performance right across the range of uses. Messing with that will just mess it up.
IMO, better to spend time keeping the engine in the condition that it was designed to be. That is clean from carbon and gunk build-up, nothing to restrict what the designer spent his whole life trying to achieve. Optimum.
it all sounds so old fashioned now, with injection and computers, chips and so forth. Carbs are just about extinct these days!
Again just my opinion.