Shimmed wastegates are the rage now for all turbos, good idea and lots of track time behind the modification.
This may well be a viable option along with a few other mods in liew of the S2 fiasco. (If you don't think you are being jerked around, wake up and smell the coffee!)
Remember how our gas prices went from $.50 to $1.50 back in 1973-4?
If you want to charge WAAAAAAY to much for an item, create a shortage!
I think this 500 kit thing is total fabrication!!!!![?]