Hey Nifty, Ther right on the money with the three methods mentioned. all of them will cool the intake charge. Water methenol mix has the least HP gain. Nitrous can cause alot of heat to the pistons. Propane really complements diesel. They both burn slow. Your emission level will also decrease. The last item to reduce EGT's is a bigger turbo. This nodoubt is the most expensive but you don't have to fill it up and you can use it 7-24. The water methenol can run all the time if you have a big enough tank. The nitrous and propane are for short burst's only. I can run mine with a 14,000 gross weight at 40lb manifold pressure with about 850 on the pyro.