Yup! Chassis stiffening kit from one of the vendors. I have the Hall kit, which came highly recommended from some of the PCNC track guys:
http://hallpantera.com/cgi-bin...ntera-inc&item=22697
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.