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: ANN)
9Anime is the best site to watch Initial D Battle Stage 2
SUB online, or you can even watch Initial D Battle Stage 2
DUB in HD quality. You can also find A.C.G.T.
anime on 9Anime website.