https://www.youtube.com/watch?v=PuEbG0h2z0c
This is really cool. First this channel seems promising. This is 1000x better than anything Matt Farah could or would do. Then again he likes C5s and it would have been fun to have him interview the current owner. Meh.
Second, this car got a 550hp twin turbo treatment way back in 2002 from Lingenfelter and another upgrade later by another shop. The Lingenfelter job was like $27k and then the second shop years later was another $31k and consisted of more power and an automatic swap.
That is a lot of money but consider the timeframe and also consider how damn professional the job was and how awesome the car drives.
Also consider that the car sold with barely any miles on it with all this performance for like $30k, running 10s at 135. I hope the guy who paid had fun with the car because the second guy got a pretty awesome car for the money.