i got a buddy who has a 1995 cheverolet 3500 6.5 turbo diesel extended cab ran great and towed fine till he hit a cow got it rebuilt nothing on the engine had to be replaced that im aware of he had it straight piped a couple weeks ago truck has not been as powerful since getting rebuilt can only seem to build 10lbs of boost from turbo and getting more black smoke than before truck has to be dropped out of overdrive to tow two horse trailer with two horses and has trouble getting past 60 mph towing if anyone has any ideas please let me know

 

make sure the fan clutch is working right he also may have clog the rad. fins from hitting the crow or maybe T-Stat gone bad

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also make sure the air cleaner system is open right