A friend of mine would like to change the original clutch of his vRS with one more performant.

Questions:

1= which is the stock size of the flywheel and also of the clutch disc?

2= which brand (Sachs, etc) does provide the best offer for a replacement?

I would much appreciate your answers...

I think a common upgrade for the flywheel is the single mass Golf G60 item.

As for the clutch, depends what you want from it really, and how much power you intend to put through it. Will it be driven on a track or in heavy traffic a lot?

Mostly on the highway, but some traffic also...