Lexus insiders suggest the car's on-sale date has been delayed while the company fine-tunes everything from styling to performance.
It's believed Lexus is targeting a top speed for the LF-A of 350km/h, ensuring it's viewed as a serious supercar contender against more fancied brands such as Ferrari, Porsche and Lamborghini.
Currently, overseas reports have the LF-A nudging 330km/h, which is apparently not good enough for Lexus engineers.
Like any supercar, though - or elite athletes - the remaining performance gains will no doubt cost millions of development dollars as the law of diminishing returns kicks in.
As well as the most expensive vehicle to ever wear a Lexus badge - pricing hasn't been hinted at yet, but few expect it to sell for less than $300,000 - the LF-A will become the most exclusive Lexus ever.
Lexus is said to be limiting production of the LF-A to just a few hundred cars a year, ensuring it as least has the exclusivity of a true supercar.
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