CY is a small market; in fact I don't think we've had other members with cars in CY on the forum. In any case, I recommend you treat the car like a UK model, as I can't envision Subaru having something specific and right hand drive for a smaller sales area. If that's the case, the Prodrive package had more than one option; there was a back box that alone would not offer any improvement, but they also offered modified intakes and ECU mapping.
Contact Prodrive direct and look through their back catalogue.
For the maintenance, look at your owner's manual and prefer authentic parts. If your car didn't come with a manual, look at the UK version. The US version states timing belts are due at 105K miles, for example, so yours was done much earlier, and I don't know if the difference was intentional or not.
The air filter, oil filler cap, and battery are not standard items. Check the back box and follow the exhaust backwards to the turbo to see if the midsection has also been replaced. If there are no heat shields or fancy heat shields around the up pipe and near the turbo, then the up pipe has also likely been replaced. Prodrive also provided suspension and body bits.
I looked up Subaru Cyrpus:
(I can't tell from your member name whether you can read Greek or your location; if you're in Lefcosia ring them on 00 357 22-491655).