I have no budget cut off to speak of.
So far I have spent about $1200 on just parts for the truck to do the turbo and water injection install that got me about 90% of the major parts and inclueds all the expensive ones like the turbocharger, manifold and every thing but the tank for water injection.
I just weigh the cost of the mod against possible gains. I like to see +1mpg per $200 spent or $10 per hp or ft.lb of tq (with out effecting MPGs).
Rounding down, the turbo install alone should give +60hp +110tq and +2mpg. So to me the turbo upgrade is worth at least $1400.
The water injection (about $200 of that total so far) should add a solid +1mpg to that and give an additional +10% to +20% increase in torque and hp. The water injection is right on the dollar limit line for an eco mod, but its power increase, EGT reduction and its engine cooling effects will be a welcome addition too.
Water injection has been known to cure the nearly unsolveable over heating problems the 6.5L is known for.
I am considering a DIY header coating, since it is cheap and I have a full sand blasting set up at home, other wise the $220-$240 I have been quoted just isn't going to work.
You can keep exhaust wrap from absorbing oil by coating it with heavy silicone spary designed to seal header wrap.
Design Engineering DEI 010301 - DEI HT Silicone Coating - Overview - SummitRacing.com
For my manifold cross over pipe I have an oil and water proof silicone sock that I salvaged at an industrial junk yard. Wrap and spary will be used on the first few feet of down pipe.
I dont want my vehicle to catch fire.