Whakaotihia te rerenga e whai ake nei: Ko te waahanga miihini o te Mustang kaore i te whanui kia uru ki te miihini Boss 429 nui, no reira ka kirimana a Ford ki a Kar Kraft o Dearborn, Michigan, ki te whakarereke i nga Cobra Jet Mustang 4-tere ki te whakaae. Ko Kar Kraft he whare whakamātautau motuhake a Ford i mahi hei Hangarau Waka mo nga Waka Motuhake a Ford. Kar Kraft i mua whakawhanakehia te tuatahi GT40 MKII (toa o te
1966 24 Hours o Le Mans) me te hoahoa me te hanga i te GT40 MKIV (toa o te 1967 24 Hours o Le Mans).