Shuichi Matsumoto is the personal mechanic for Takumi Fujiwara's AE86 and possibly Chief Mechanic for Project D. He is the driver for Project D's support van #3 during their expeditions.  In chapter 39 of the manga, Matsumoto was asked by Ryosuke to tune his FC for his anticipated encounter with Rin Hojo.  (Source: Initial D Wiki)

Takumi Fujiwara and brothers Keisuke and Ryousuke Takahashi have formed "Project D," a racing team aimed at bringing their driving skills to their full potential outside their prefecture. Using the internet, Project D issues challenges to other racing teams and posts results of their races. Managed by Ryousuke, the team has Takumi engaging in downhill battles with his AE86, while Keisuke challenges opponents uphill. Among their rivals are the Seven-Star Leaf (SSR) and Todo-juku.

__Mike McFarland__ is an American voice actor, ADR Director, Script, and Line Producer at Funimation Entertainment.

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After defeating every racing team in the prefecture, everything comes down to one last race. Takumi Fujiwara has never lost a race, but when his opponent is also using an AE86, it turns into a battle of the AE86. Will Project D succeed in the final and most difficult race of Initial D?

Takumi is approached by RedSuns leader Ryosuke Takahashi and offered to join him in forming a professional racing team. Before coming up with an answer to the proposal, Takumi seeks retribution by issuing a rematch to Emperor leader Kyouichi Sudou, who previously defeated him due to an engine failure. He is also challenged by Kai Kogashiwa, a second-generation street racer whose father was once a fierce rival of Takumi's father Bunta.

Taking place in the sacred land of street running Kanagawa, once more Takumi Fujiwara will show his driving skills on his now legendary Hachi-roku.

Only the fearless survive in the white-hot world of street racing, as teams take on dangerous roads in the shadow of Mt. Akina. Behind the wheel of the mysterious "Ghost of Akina" is Takumi, on his way to becoming the greatest racer ever. (Source: Tokyopop)
 
Note: the chapter count includes 6 extra chapters published in volumes 2, 3, 30, 33, 39 and 48.

This is simply the OAV summing up the major events and battles of "Initial D 4th Stage" much like the "Initial D Battle Stage" original summed up the first 3 seasons. Additionally, has 2 extra battles from the manga that were not incorporated into the original 4th Stage.
 
(Source: Anime News Network)