Quote:
Originally Posted by a_Username
No he didn't upgrade his fuel system. I don't specifically remember what mechanically happened when it blew, but I'll get you those specifics after I ask him lol. However, my brother has a Duramax with an exhaust, CAI, EFI Live, and a built transmission and his held up great! Even before the built transmission, he had no problems and he only choose to build it because he saw all his buddies limp their transmissions. 
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it also depends on how hard the vehicle is driven/pushed.
if your brother hasn't done it already, tell him to swap his head bolts over to ARP studs. cheap insurance against blown head gaskets. also an EGT gauge is another cheap upgrade to add. when the temps get too high, get off the pedal!