As long as you gave them the correct dimensions and weight, chances are those rates should be accurate. As for packaging, you may want to take it to a FedEx/Kinkos or some other pack and ship store. They can either do the packaging for you (potentially risky, depending totally on how good the employee is, and I will say that they are not all good), or maybe give you some ideas.
One suggestion you may want to look at would be to find some large pieces of Styrofoam, maybe 12 to 16 inches long and the height and width matching the front lip, to tie or tape to the inside edges of the 2 corners on the lip so that they don't flex as much. Then put some basic packing material to fill in the middle gap, then try to wrap the whole thing in bubble wrap or foam wrap just to keep it from getting scratched. Then, either try to find one big box for the whole thing to sit in (difficult, I know), or take and cut smaller boxes and try to fashion them together to make an outer packaging for the whole lip. It may not look necessarily pretty, but as long as you did it right it should protect it, which is what really counts.
Best of luck to you anyways!
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2009 Nissan 370Z Base w/ Sport Package
F.I . LTHs with Non-Resonated Cat-back exhaust (C.F.) / Stillen Gen3 CAI / Up-Rev Tune
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