both of you are right...its pound per square inch (psi) but psi is a unit of pressure....so 8 psi is 8 pounds per square inch of pressure
the way body kits are made is by a plastic mold of a plastic mold of a plastic mold (you get the idea) of a plastic mold that has the same specs that fit whatever car the mold is for. there for there are hardly ever 2 body kits alike...same as there are no 2 cars exactly alike. i dont know much about engine work besides the basics and that is why i get on here to ask questions but i do know how to work on the body and if you want your kit done right to where it looks half descent then you need to take it to someone who knows how to work on the body