My dad just gave me his 91 cummins you can see what it has on it in my signature. Anyways i was thinking about putting ddp stage 2 75hp injectors and the denny t stage 2 fuel pin. I have the gds 60mm turbo upgrade and a turn on the fuel pump.With these new mods will i see 40+ psi and if so will everything hold up ok?

 

even if you saw 40 psi, you would be in the "hot air" range. Hybrid H1C's are good up to 40 but 39, 40, 41 and up is just hot air, no unmph. Also, without re torquing your head bolts anything over 35 is risky, with them torqued over 40 is risky

 

every engine is different, you could blow the HG just driving down the road.

i have been putting 39-40psi into my cummins for 3 years with no problems so
far, just don't do it on a cold engine, make shure your up to operating temp, and like Zac said it's a gamble every time you mash it.

Dar