Brabus box for A / B class only for a Manual car??

[A210AMG]

Hello

Spotted this, although it states its only for a manual?

Any reason why?

I would be tempted top fit this on the wifes B class (same engine) but its a CVT?

BRABUS PowerXtra Performance Kit D2-III W169 A180cdi on eBay (end time 30-Jun-11 11:48:45 BST)