Hi, Miko,
I'm interested. I recently bought an exhaust system on eBay that came from a SoCal shop, cost me $75 in shipping. Didn't fit. Sent it back. So... if your other offers have fallen through, I'll pay you $550 + $75 to ship Ground. The only concession I would ask for it to do the deal through eBay so that we are both protected.
I'm not attached to the deal. I'm just throwing it out there in case it serves you at this point, as I'm willing to part with $625 to have that exhaust (I have on my 2010 G37 sedan... it's sick in a beautiful way).
Frank in Texas