Lets see here?
The LS3 engine already exist and is a cheaper than the LS7 to start with, so modifying it and adding a SC takes it up a couple of thousand higher than the LS7.
The body panels already exist, so GM makes a few
MINOR changes in it, no big deal!
The brakes? Here we have a big expense but not as expensive as aftermarket, remember GM buys at below wholesale in the thousands, a few thousand at the most!
A little more Carbon fiber (roof), the molds are already in place and changing material is maybe a $1k to $1.5k max!
I haven't read which transmission, but the new 2008 TR-6060 used in the C6, Z06, Viper & GT500 is good for up to 1000 horsepower, so no extra expense there.
Now we come to demand. As I've stated many times on several forums, if idiots with more money than brains run out and pay over MSRP then they create a false sense of value, all one needs to do is sit tight and refuse to pay over sticker, the dealers will eventually drop the price or sit on a ton of money on their lots! Look what happened with one of the hottest sports car buys in recent history (the C6 Z06), there are plenty of dealers now selling for $6k to $8k off sticker. In a year or two after the ZR-1 hits the market, the same thing will happen, even if the production quantity is small! Remember the C4 ZR-1?
And we don't need to compare the ZR-1 with exotics, the present Z06 is now the standard to compare it with since 75% of the new ZR-1 is a Z06!
Bottom line, this car isn't going to bring very many buyers to the table at $100k a copy, and the only ones that will buy are those that money is no issue and can afford to have what many others can't afford. I don't believe GM is aiming for just that small sector of people.
EFE Z06