I've never seen a used Mugen exhaust being sold for $700 or less. They usually retain their value very well. Considering they are 1300 or so brand new plus shipping and waiting. Stock exhaust...is pretty much worthless or you could purchase a new one for $50-$100 dollars(I've seen people give them away also). Now driving for 4 hours is what might make it not worth it. If you could meet him half way or have him split on gas that it could be worth while. I would get the Mugen, at least you will know when you are ready to sell it will hold its value, unlike the Fuji which would depreciate more, thus in the long run you might lose more money.

 

That price is too high for me. Now with the hold up, it is WAY too high. Unless you REALLY want the Mugen exhaust, I would buy the other one and sell your stock one.