What you have to remember Carl is diesel engines are limited by the amount of fuel they can consume whereas petrol engines are limited by the amount of air they can consume. Putting more fuel into a diesel (by one means or another) is the only way to make more power.
Youv'e obviously never seen a diesel running on it's sump oil, scarry stuff!
The particle filters and catylysts will be rated to operate over a range. If you subject it to conditions outside of it's design parameters then there will be the possibility of premature failure as with all things.
Previously: 2007 335D MSport E90 Le Mans Blue, 2004 330D A Sport Silver Grey, 2002 330D A Sport Saphire Black, 2001 320D SE Touring Titanium Silver, 1998 M3 Evo Techno Violet, 1996 328i Sport Montreal Blue, 1994 325i Coupe Red, 1989 325i Sport 2 door Dolphin Grey,1986 325i SE 4 door Lachs