The bonnet bulge is for the Supercharger which is believed to have been developed by S 'n' R in readiness for a ZS X model.
Of course...........it will be on display at the garage today for the 'Open Day' all of which will be outside including the SV Ralph has as well as Andy's ZTT in Aurora and his 25 GSi and Express van.
Worth a pop down and look..............I'm not 100% sure but it is possible that Ralph may give a demonstration of the SV running..........the sound is fantastic I tell ya!
Right.............I had better get my arse down there before I am too late
Jim