Alternative to Nitrous
 

So recently I was talking to a tuner buddy of mine, and we were talking about my 2.5TDI, and what I could do as far as injection goes. I mentioned NOS, but he countered with diesel's can't use NOS, so I asked what then, he told me, Propane Injection, so my question for this forum, has anyone else heard of this?

Diesel tuning seems to be a fairly new concept, so even if you don't know anything about it, what would be your opinion on doing this?

Yes, propane injection is well-known in the diesel world. I don't know much about the chemistry of it, but if you find a diesel forum online I'm sure you will find a wealth of info.