Originally Posted by Nomadgene
The way I remember it was that his father bought a WRX and waxed his son's butt on the mountain to teach him a lesson.
The boy then began using the WRX to deliver tofu and was developing skills in that car when the series ended the 4th stage. They never showed him actually racing the car but it was implied that he was going that direction.
To my knowledge, I've watched all the available episodes.
He does alternate between the two cars for tofu deliveries. However for project D he continues to use the ae86.
Originally Posted by EvolvedAK
I didn't really think that was implied at all. The purpose (in my view) was to expand his abilities and broaden his horizons. Knowing your enemy, in order to better to defeat them.
Remember he only drove the Impreza every other day. Fanbase assumptions could turn up being correct that he switches to the FRS. Either way I definitely expect a different vehicle, otherwise 5th stage will just be a repeating story. I just don't expect to see him in a AWD platform.
Depending on how they close they follow the manga I don't forsee Takumi going to a ft86 in the near future.