Such rumors are meant ONLY to hold the shacking APPL stock , and nothing else.
Remember Apple TV set rumor, Sapphire rumor, iRing rumor, Liquid metal rumor?LOL
BTW cars have not the profit margine that fits to today's Apple's stock price. So-no go!
Well ... Mclaren is making big profits with their new lineup .. and its just too good now .. so i don't think they r willing to sell shares anytime soon ..