There is no plastic unit that I know of.
This unit should make more boost than that 5.3L can handle, I haven't personally tried it on a stock 5.3L, but 12psi should be no problem.
I didn't go through the install with the parts I have, but every part came off the truck and what you see in the pics is included.
the major parts are there, xchanger, charger, coolant tank, water epump, bracket, so anything else would be minor, like clamps, hoses maybe.



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