458 vs 458 speciale power difference ?

hi there Iv tryed to look online but no luck im trying to find out how they got there extra horse's on the speciale compared to the normal 458 italia engine. I know its not easy to get extra power out of a naturally aspirated engine when there both the same engine cc. 562bhp vs 597 bhp that amazing 35bhp difference.

what mods did they use to get that extra 35bhp I know a engine tune is 1 of them but there gota be more to it ?????.

No way they got 35bhp from just a engine tune. thanks oz