I traded in my G37 yesterday and took off my TopSpeed exhaust a few days ago before the trade. I have no box for it or bubble wrap. You guys have any idea how much a box big enough to ship this exhaust out would cost? Also, around how much would shipping be for me to ship to someone? I have it listed for sale but would really like to sell it local pickup.

 

Do you know how long it is? How much it weighs? This is basic required info to know how much it costs to ship. Once you have that information, go to USP.com or Fedex.com and use the same tool that everyone uses to estimate cost.

If you go to a place that sells appliances you can get a box for free. If you are insistent on buying one, it might require 2 boxes taped together end to end depending on the length of what you're shipping. UPS sells boxes. U-haul does too. Or Google packing and shipping places where you live. About $10 for a big sturdy one to ship exhaust. Throw in another $15-20 for bubble wrap and packing peanuts.

Wrap it and pack the box well so it doesn't flop around in there and get damaged.

 

You should also be able to wrap the pieces in bubble wrap real tightly, cover with carboard pieces and then just tape up the whole piece, they do that for bumpers and odd sized parcels since finding boxes for them can prove difficult.
Here's a thread that may help
~ How do you ship Exhaust ~ Ideas? - Corvette Forum