I don't know if its possible to fit but these guys make a kit that would be right up the pantera alley, rear exhaust mounted. Might be worth looking into:
http://www.ststurbo.com/
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.