hi i have got a mk5 2.0gl and i am wanting to turbo it, i have got the intercooler ect but not a minfold exhaust or turbo yet.

i was wanting to know if any of you could please help me as to what i should do about the manifold, exhaust, and engine head??

do i need to lower the compression? and also can i get a custom flange made or will it be better with another exhaust maifold that will bolt straight on??