hmm, i think they all come with air suspension the LS400s or in japan celsiors. Correct me if im wrong.
Ive seen the air struts there appears to be no coils just an air bag and oil damper...
The Spec 'C' Celsior / LS400 are the most well feature models. Full of electronics, leather etc. Spec A is the more Basic model.. ive read it has coils and so does the B spec model.. Have to look at the shocks to make sure...
The stereo is fantastic. Its a Nakamichi 7 speaker system 1 in each door, 2 tweeters and a 10" sub. Sounds pretty good for stock, Nakamichi is a quailty jap sound brand. The sound is much the same as my v8 soarers 7 speaker system.
Regarding the LSD i doubt it would have one very much. My soarer is more sporty than the ls400/celsior and it has no lsd so id think you would need to find an lsd that would fit in the celsior. These v8 cars didnt really have the need lsds their luxury cars!
In general there pretty good cars, not quite as fast as the v8 soarer as they are about 1800kg but comfortable! If you want the featured model go for the c spec one its great, even the rear seats recline electronically!! and have a massaging feature!