I don't know if you guys have seen this but:
SMS 570TM Challenger
SMS 570XTM Challenger
Built by Saleen.
http://blogs.carcraft.com/6244840/auto-news/saleen-to-build-modified-challengers/index.html
SMS 570TM Challenger
SMS 570XTM Challenger
Built by Saleen.
http://blogs.carcraft.com/6244840/auto-news/saleen-to-build-modified-challengers/index.html