actually you would be very surprised what the cummins guys do to get them down there. sled pullers especially. i was talking to one of the pullers there (cant remember his name) but he injects so much water than EGTs never surpass 1200 but its about 3 gal worth of water poured in it by the end of the track.
we dont see over 1500* on the small tune in ours but that is a very good flowing head and big turbos. Curious what it will drop to on nitrous.
But i agree, let that crap go out the exhaust. My truck wont see over 1300 on the 600rwhp tune at WOT even pulling the trailer. the race tune is another story but im driving the stock turbo really hard then.
James my truck barely hits 1200* EGT's another reason i think mine lasted so long... TONS of air vs available fuel.