▁asp ir ated ▁engine ▁or ▁an ▁optional ▁ ▁super charg ed ▁ 4 . 2   L ▁V 8 ▁engine . ▁The ▁latter ▁engine ' s ▁val vet rain ▁had ▁a ▁dual ▁overhead ▁cam ▁design ▁with ▁four ▁val ves ▁per ▁cyl inder ▁and ▁its ▁top ▁speed ▁was ▁electron ically ▁limited ▁to ▁. ▁ ▁Tr im ▁levels ▁At ▁introduction , ▁the ▁X J ▁was ▁market ed ▁world wide ▁in ▁numerous ▁trim ▁levels , ▁including ▁X J 8 , ▁X J ▁V anden ▁Pl as ▁and ▁X J R ▁in ▁North ▁America , ▁and ▁X J 6 , ▁X J 8 , ▁X J ▁S over eign ▁in ▁the ▁UK . ▁For ▁the ▁ 2 0 0 5 ▁model ▁year , ▁J agu ar ▁introduced ▁a ▁long ▁wheel base ▁variant ▁of ▁the ▁X 3 5 0 . ▁For ▁ 2 0 0 7 , ▁the ▁prem ium ▁model ▁was ▁the ▁re int rodu ced ▁as ▁the ▁J agu ar ▁S over eign ▁when ▁the ▁Super ▁V 8 ▁and ▁Da im ler ▁versions ▁were ▁dropped . ▁ ▁Da im ler ▁Super ▁E ight / Super ▁V 8 : ▁The ▁Super ▁V 8 , ▁also ▁known ▁as ▁the ▁Da im ler ▁Super ▁E ight , ▁was ▁the ▁most ▁expensive ▁model , ▁with ▁the ▁X J R ▁being ▁the ▁second ▁most ▁expensive ▁model ▁in ▁the ▁range . ▁The ▁Super ▁V 8 , ▁which ▁deb uted ▁in ▁the ▁ 2 0 0 3 ▁model ▁year ▁in ▁the ▁new ▁X 3 5 0 ▁body ▁style , ▁was ▁initially ▁of ▁a