Having had both a KO3 MK5 GTI and a KO4 Edition 30, I think it's a bit of a myth that the KO4 engine is slower off the mark than a KO3 engine. I'm pretty sure my Ed30 is quicker off the mark than my GTI. Apart from being noticeably quicker all round, the only other difference I have noticed is that the Ed30 is not so keen on 6th gear in town driving, whilst my GTI was okay.