It is the same engine illyan, its been tweaked thats all, one thing i didnt check was whether it has a higher lift cams on the camshaft, which would induce more air/fuel.I expect they have tweaked the air induction side of the things, cus the air box on the GTI is a poor design, maybe larger incooler,and remap of the ecu. that same engine has been tweaked before by other car makers ie audi producing more horsepower the vw's effort. theres NO major changes like you say in your post between both models. Its a shame there isnt, you'd expect more for a limited edition, i cant see residuals making too much difference later , as whats proposed the standard GTI will have 230hp as STANDARD later in the year, before the arrival of the MK 6