thats awesome economy man.
If i got anywhere near that i would be a happy camper...
Id say its just the exhaust and a normal skyline thing... Most of them do it and you just need to keep on top of keeping it clean...
If it gets real bad rub it with a clay bar, give it a quick buff with a polish and throw a wax over the top...
wont last foreva but might make it easier to get it off for a bit
good luck.