Even heavily modified, it's still crazy expensive.
Over here, most heavily modified cars won't sell for near that much, especially if it's not a 34-R.
And it being 6 years ago, in todays money, with the yen rate, that would be close to $45k or so, I'd guess.
Right now on Yahoo auctions, an ER34 with a swapped RB26DETT is around $9k the moment for a buy it now price.
http://page9.auctions.yahoo.co.jp/jp/auction/k135632713
Wow...I knew the market value for Skylines in the U.S. was expensive, but had no idea it was that expensive.