A friend of mine over at Essex Parts (main US Dist. for AP Racing products) says they are in final development for both a 4 and 6 piston kits for the S197 (S550 kit coming soon).
This is great news for those looking to loose some unsprung weight but also for those looking to run a 6 piston kit designed to clear 18" wheels (a favored track setup) with a big brake kit. Should be avail. in the next few weeks.
I don't get anything out of this. Just passing on the info.
(see link to Corvette setup, which will be the basis for our kits)

http://www.essexparts.com/shop/compl...te-bundle.html

http://www.essexparts.com/shop/compl...te-bundle.html

 

Looks promising. Interested to see what their prices are for the Mustang.

 

My friend said the pricing would be the same or similar to the ones listed for the 'vette.