Turbo piping required?

[Boosted 03]

What is the general size of piping that is included in most of the twin turbo kits available? I'm looking for close to 1000HP on a built 96' cobra engine, and it will be a DIY project. I'm looking for the turbo to intake size and the header to turbo flange size. The final recommended exhaust size for this range of HP would be nice as well. I'm curious as to what these turbo manufacturers are using. Thanks in advance.

 

[iboost5o]

To be honest i'm not sure - however most kits i've seen look like 3 inch pipes to me.

 

[Cobrastruk04]

3 inch piping here