Looking to buy a 02-05 GTI 1.8T

I'm thinking about buying a GtI. I have a few questions. How much power can a stock motor handle? What size injectors does it have? How muck boost does it have stock? how much boost can a stock turbo handle before it max out? thanks

one more thing. what is the engine code. Example. the 300zx tt engine code is VG30DETT.