they will want an import classification for the exhuast. here is one to try:
The applicable subheading for the resonator assembly will be 8708.92.5000
, HTS, which provides for parts and accessories of ... motor vehicles...: other parts and accessories: mufflers and exhaust pipes: for other vehicles. The rate will be 2.5 percent.
yes, normally you will have to pay a duty or tariff on anything that's new that you import into the US. the rates vary from nothing to 30% on a variety of items. that's why there are different prices on things when you order overseas, because someone has to pay that fee (distributor, dealer, end user, etc). the Govt wants it's money. But that seems excessive even for UPS.
there should be a list of charges- the actual duty paid (and corresponsing classification so you can confirm that they have it classified correctly) and then they will charge you a fee as they have to do the paperwork and "broker" the import. I could see it being $40-80 or so but that sounds crazy!