German truck company named Krupp had a truck named mustang, word has it Ford could have bought the name for 10,000 dollars but chose to wait and rebadged the German cars T5
500. I was going to make a WAG of 4000. I when to an old mustang book titled the Enduring Mustang that show the KR and noted the 500 production. Th article referred to the stripe package and go faster stripes. Seemed there were few performance upgrades. Oh the mustang II.......
Something a little newer, Multi Valve engines. So for a long time engines were two valves per cylinder. Then 3 and 4 valve engine started to appear. What Mustang was the first multi valve engine. Either a 3 or 4 valve. What mustang and what year is your answer.
Hmmm. Thinking hard about this one. I know he's been around for a while but don't remember anything before 1999. Could be the 94-98 but I will go with my gen 99-04.