4HP22 Shit kit or else modifications

[Schwarz_325i]

I read a lot recently and it seems that there are many modifications to do to the valve body of the 4HP22 automatic transmission.

Call them like you want: shift kit, correction kit, etc.

Anyone heard about them? What about their performances? Is the installation easy or pain in the !@#?

There is not a lot of information about those modifications. Sincerely, I don't think there will be a huge gap in performance of the transmission, but I could be wrong.

[Imagine_M]

there is a video on here from a guy that did it and it eliminated the lag from 1st to 2nd seemed like a good upgrade

[Schwarz_325i]

Anything about how to install this kit?