Cheers matey

I am thinking of building a 2.0L 16v
I already have a 1.8 KR engine
What is the best route to take???

9A
6A
etc etc??

A mate of mine has a GTI Engineering Mk2 and i want similar performance to that.
His will beat another of my mates 20vT Mk3 all day long and thats running 200+bhp but they are heavy cars though.