Has anyone ever heard of a saleen S-427 mustang?

i saw this in a dupont registry a few years ago and have emailed saleen and cant get them to respond, the car looked to be about a 1997-2001 i haven't seen the pic in about a year but want to know if this was a saleen production car or someone put a 427 with a saleen supercharger in a mustang. the car was selling for about $275,000. Prototype? one of a kind? it looked to have numbers on the bumper like it should and they were in the correct location on the car. please help this is making me nuts! ive been reserching this for the last 8 months and have nothing!!!|||that's probably the serial number and nothing to do with the engine size.....but someone could have made something up with a stroked smallblock 427...a lot of those running around..|||if the car company denies all knowledge its a one off