A mate of mine has a turbo technics 8valve engine that he had in his mark 2, and it had all the proper management on it and a 5th injector that comes on with the boost, he sold it to my other mate who is putting it in his mark 1, its around about 200bhp!! i think he said it did 14sec quater miles (i think)
I am toying with the idea of turboing my scirocco in the spring/using a digifant engine so i may be badgering you for advice nearer the time!