Assuming it's the same as the one in the new Golf GTi then this extract from a VW press release might help:
2.0-litre turbocharged direct injection engine. The turbocharged engine of the GTI is from the third generation of the EA888 engine series and has a completely newly developed cylinder head. A unique feature in this power class is the water-cooled exhaust gas circulation loop to the turbocharger that is fully integrated in the cylinder head. This type of exhaust gas cooling makes a crucial contribution towards improving fuel consumption at full load in the new Golf GTI. In addition, the 1,984 cc TSI features variable valve timing with dual camshaft adjustment. In addition, the valve lift on the exhaust side is adjustable over two stages. This enables optimal control of the charge exchange process for better performance, fuel economy and low emissions.