I fitted a pair of the four pad calipers that Darren mentioned to my S2R.
They came as a Ducati Performance kit complete with hoses:
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They're P4/34s and the Brembo number is 20.7850.11. (LH) & 20.7850.21 (RH). They're actually still available new and Harris advertise them at £600 per pair complete with pads. (Carpimoto have them at £380 per pair ex-VAT
https://www.carpimoto.it/en-GB/Searc...=1619443683172).
The main difference with the four pad calipers is that, with four leading edges acting on each disc, the initial bite when you squeeze the lever is noticeably, (and I mean
noticeably!), sharper.
As Darren mentioned, you need different hoses as the banjo orientation is different between the OE calipers and the Goldlines as you can see from the pictures.
Definitely a worthwhile upgrade.