they do make a Pro
that comes pre built but without engine & radio!
but it does come with all the CNC alloy bits plus all the Hardened diff parts[8D]
i wouldn't bother fitting an extra rear brake disc as the car stops OK on 3 discs!

how fast does it go? how long is a piece of string?

there are way too many variables to consider to even contemplate answering that question

how fast? more than fast enough for the type of person who asks that question