Countach

Countach (カウンタック) is a manga series by Haruto Umezawa. It was serialized in Young Jump.

Plot
The day after he finds himself dumped by his girlfriend, Sorayama Shun receives a letter... from himself? The letter was from Shun 25 years ago for his future self. The letter reminds him of the time when he dreamed of owning a Countach and being a successful professional racer. With loads of luck and his ambition to make his childhood dream come true, he finds himself as a new owner of an LP400 Countach.