Complex sentence: Optional for the LSJ was a performance package coded G85 that added Recaro bucket seats and a limited slip differential (LSD), lsd for the 2005 wasn't standard but option (performance package came with lsd) and was standard in the 2006 + models.
Split into simpler sentences: Optional for the LSJ was a performance package coded G85 that added Recaro bucket seats and a limited slip differential (LSD). LSD was optional for 2005 models (performance package came with LSD) and was standard in 2006 + models.