Up here there are almost as many fast diesels as fast cars lol, a few 700+hp and 1500+ft/lbs Dodges round, and one Duramax that I know of.

 

did some research last night... apparently it's not "recommended" to exceed 50 psi unless you o-ring the heads... which costs $300. If you get headwork done a lot of the shops will o-ring them for free while they are at it. This applies to the cummins, I didn't look into the duramax and international.