[strat61caster]

Originally Posted by funwheeldrive

Huh? Where is your source for that? Tada himself stated that he wanted to make an engine change with this car eventually.

Yet when I meet up with rival sports car chief engineers (and we do at various times around the world), we all talk about what we call the Devil’s Cycle of ever-increasing power, speed, weight and price. So I started to work on the packaging requirements for this different sort of sports car.

http://blog.toyota.co.uk/tada-how-to...eated-the-gt86

The article you use for your basis that the engine will change:

"I hope to make an engine upgrade at least one time with this car," Tada told Drive.
"We [have] already tried all possibilities and there are several types of 86 prototypes at the Toyota proving ground now; one is a turbocharger, one is bigger displacement and [the other is a] special hybrid system."
...
"The boxer [engine] has benefit for low centre of gravity, but [we will develop the] concept for the next generation car first and then we will look at best possible options to fit," he said.

http://www.drive.com.au/motor-news/t...809-2rleu.html

Continue speculating as you see fit.