Was one of the Mustangs you saw racing white with blue or black stripes? If so, that's the Multimatic Motorsports Mustang:
The race was part of the Grand Am Cup series.
Ford is planning on a joint venture with this company -- you will be able to buy a similarly equipped Mustang. Kinda like the last gen Mustang Cobra R they did.
Now THAT would be a fun DE car!
Regarding their solid rear axle -- three points:
1. For the drag racing crowd, that is a requirement -- independant rears just don't hold up to the harsh launches as well.
2. While I used to complain about how the Mustangs need to 'get with the program,' their setup seems to work, given how well they are doing in road racing.
3. Who am I to complain about a solid rear axle? My 944S2 has Torsion bars in the back!!!
-Z.