[JL8Jeff]

That's a tough call because most 4th gen LS1 cars have already been modified so if an owner wants to sell and get a new one, they'll probably take a loss due to the modifications(unless you find the right buyer). If most people decide to trade them on a new one then the prices will go down as the reality of dealer trade in prices hit. I think the prices of good condition 3rd gen cars are already climbing so they'll continue to hold or go up.