The LSD was part of the p30 pakage up until 2010 after that it was a stand alone option the stifer suspension was also scrapped after that date
Some seller's are mentioning the uprated bhp but they weren't so basically before 2010 pp cars consisted of LSD ,sports suspension, red calipers with 2 piece rotors standard 457bhp with alicantara wheel
Post 2010 ppp cars were uprated engine internals with 487bhp red calipers with 1 piece rotors which look like 2 NO sports suspension or LSD imo there's no point owning a w204 c63 WITHOUT THE LSD factory or quafe etc

I wouldn't say that price is high at all