I dunno what your quote was, but for the sake of shared info: I sold a pair of Flowtech SBO headers to a member in Austin, TX. USPS charged me 63 dollars to ship.
I think he boxed it and UPS wanted to Charge him $331. He told him he could ship a refrigerator for that.
Its a Hollow F-body bar that weighs about 15 lbs, so it isn't even that heavy.