GM did that for the W41's back in the Fire Hawk series....
Mantaparts has all of GM's stock in such,
IMO its not worth it.
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08
There is a post in this forum probably 5-6 months ago about this car, and that video.
FU Tuning
good luck getting it from mantapart though!
unless of course you actually GO there and inquire about it, maybe buy the parts on the spot.
I believe I can see the future... as I repeat the same routine....