Bumpers are not relevant for TÜV if you are driving cars like ours. Differnt story
for latest cars ;-)
The photo didn't show the complete package. My body who ist working on Panteras for almost 20 years has desigend a diffuser which matches to the oilcooler and also seperate the airflow from the hot engine. Due to the 180° turning headers (which are cramic coated) we elimnated another source of hot air.
He is using this one on his two racing panteras with success. I'll be at Spa in Mai for the 6hours classic race and on the way (180 mls each way) there is enough time to check it. The engine has 100 mls on the speedo (after rebuild) so I have to treat it careful.
Still on my whish list are some rear diffuser for covering the Original Exhaust area and some floor mats as well (my wife wants it so I got a clear mesage). But first... enjoying the car together with my wife