I think the factory mono 749/999's look much better than the bip's,they seem to accentuate the long low café racer look of the bike,ab fab......its the only bike I've ever had that I can go into my garage just to look at...for ages ...and I've had a few over the years. Did I mention that yellow ones look best.....
05/06 should have the deep sump and later swingarm? You can't go by the reg plate though as an 04 bike might have not been registered until 05?
As far as I am aware, all 999S' have the deep sump regardless of year. They were all meant to, that's for certain.
, Not sure what you mean by 's system'...if you mean the exhaust system,then as far as I am aware its the same for base and 's' models...I'm sure someone on here will tell me if I'm wrong...the main difference between the early base and 's' models is the deep sump and full Ohlins kit on the 's' and a power hike to @136bhp. The base model got the deep sump motor from 2005,together with a red frame, slightly different bodywork and different swinger.