Nitrous for blacktop 20v

[imoloq]

Hi guys!

I've read some of the threads on ZTH on nitrous injection. Apparently stock engines can install nitrous too. Hands a bit itchy already.

My questions are:

1) Do I have to have an engine management system like e-manage to install nitrous? I'm thinking of a 50hp wet shot only.

2) How much are the workshops charging for a 50hp wet shot nitrous installation?

3) Does the car need tuning after installation?

Thanks!