Hi Mate , apparently sport can be retro fitted and it comes with the button, as you say its about £800 you will find many of the OPCs will look funny at you when you ask because its not something they do often if even, so they will have to go digging . but show them this link so they cant deny its available .
http://www.suncoastparts.com/product/9X7SM.html
PERSONALLY unless you have a Porsche warranty I would be doing the following.
IPD gt3 throttle body and plenum this kit comes with the bigger silicon hose from the air filter .
BMC sports filter
custom remap
sports exhaust with valvetronics, if not got PSE (the vid is a members car and is the same set up I have.
https://www.topgear.co.uk/porsche-911-997-1-carrera-valved-cat-back?search=porsche 997
if you have PSE then just get 200 cell big bore cats
https://www.topgear.co.uk/porsche-911-997-carrera-200-cell-sports-cats-2-5-63mm
then some lowering springs to keep the car planted while you enjoy the extra beans.
there's lots more bits you can do and if your interested let me know . but those are the main power wins. the other bits are when you start just looking for a few BHP or handling gains just because you want to.
:thumb: :grin: