ED30, seat leon cupra, S3, Audi TT DEC07 onwards have the same engine bar the intercooler, only the S3 has the greater mass cooler, the engines are very different to the standard GTI engine, i wont bore you but even the con rods are strenghened, the geometry of the steering is also enhanced, its lowered 15mm and has a better but firmer suspension set up. the ED30 is easilly capable of 400bhp without any internal work needed, a GT28 71R could be bolted on and boost turned custom style high with no problem, my guess is 360bhp will be available with the standard turbo when a good quality 3" turbo downpipe and 100 cell sportcat are available and a good CAIS, and revo probobly pushing up the boost a little more.