The termi upgrade kit is avialable for the 999S-05, as written above, it converts the asymetric half system into the 57mm full system.
the downside... you have to take your termi end can apart and change the the front plate where the pipwork enters it to a new plate (comes with the kit) with larger holes.
The full system complete (new end can with big holes, 57mm pipework, carbon cover, carbon heat guard, ECU, air filters) is only £1260 inc vat (£1400 less DSC discount) so its hardly worth spending the money on the upgrade kit.
NB: the full system needs to be fitted properly and needs some 'mods' to make it fit so it doesn't foul the swingarm or melt the bottom of the fairing. seen lots of these big systems fitted and lots of melted fairings or scraped swingarms! the ECU also needs to be set up. any good dealer can do this for you, expect to pay about 4 hours labour to fit and set up.
Can be found here, £950, I was quoted about £750 from my regular dealer but I do not want the ecu or filters so he is looking to see if the pipework can be ordered separately and considering the ecu is supposed to be £400+ the price will come down to a more affordable level, hopefully.
No Khu for that transformation kit, the full bike specific kit for the 749R is £2800, I think he said about £2200 to £2300 to me.
You have a PC3 so you could buy the cheaper kit from another model and not use the ecu, they sell well on ebay to offset the cost
The 05 model 999S full s/steel 57mm system complete is £1400 and I think I can get it for about £1100 ish then you could sell your system with a brand new 999S ecu or sell them separately, you would probably get £700 + for it especially with an uncoded ecu, so £400 ish sounds tempting for a full 57mm sysyem.
I do presume that the full 57mm system would fit the 749R apart from the ecu, someone correct me if I am wrong.
I personally cannot see how this can be £1400 yet the proper 749R one is £2800, double the cost all for a titanium back box ( does not go any faster and the weight is hardly going to be noticeable to 99.9% of us ) and a pair of different intake funnels ????