Originally Posted by underpsi

What shop was this that did the ecm for you? Only way he could get 850hp out of your truck with it being stock like that would be modified files in the ecm. That's not little league stuff... there's only like 3 or 4 companies out there maybe less that can modify Cat ecm files.

What turbo was put on to support 850hp? Did your egts get hot easily? How do you know its 850hp?

Its a after market turbo rated for 750 hp, dont know the name right off my head without checking on it. Egts stay normal do get up some in the hard pulls in the mountains with 80,000 lbs plus. The man that does the down loads has put other trucks on dyno. How ever i have not seen the print out my self., yes files have been removed and completly new ones put back.....