Judge, the black Illustrated Parts & Accessories Manual published in the '80s shows illustrations of all FIVE stock exhaust systems (Pg 33 of 88). Note the tips of later ones come straight out while early rigs exit at an upward angle. People who customize their rigs are sometimes surprised- like one owner of a GT-5 that liked the look of the early angled tips, once ran his car in an open road event held several times per year. At very high speed/rpms for some 30 minutes, the scorching-hot exhaust was forced back against the tail of the car by the trailing airflow swirl and MELTED both taillight lenses! Much the same would probably happen to fiberglas rear bumpers. The setup lasted fine at street speeds
All such Parts Manuals for DeTomaso cars are available in the POCA Archives for free download to club members- you must first access the web site to reach the archives. Some vendors also sell such publications.