I'm pushing 15 lbs out of a d who said they arnt strong it's all about how the car is tuned it's not the amount of boost but the amount of power(hp) they can handle 250 stock the rods and pistons are weak the crank is bullet proof I have yet to break mine or spin a rod

 

yep, it's a known thing that psi means nothing, although your post starts off with a psi number. 15 psi through a drinking straw is a lot different than 15 psi through a big turbo.