Originally Posted by Jayhovah

With FedEx you'll find shipping to be far less expensive just by signing up for an account with them. Then pack yourself, print the label, and just drop it off at any fedex or fedex office. I don't know if this is the case with other carriers, but I have an account with Fedex for this reason.

One way you might be able to game the system a little bit... selling something on ebay comes with pretty well discounted shipping rates. Set up a private auction to "sell" the exhaust for a dollar or something (to save on the auction fees) and print the label through ebay. Never done this, but the thought has crossed my mind for needing to ship large items in the future.