Thanks PJB, I talked this through with John MacDonald today and will have the Suplex kit fitted later this month, along with some simple brake upgrades (s/s braided hoses, EBC greenstuff pads and cross-stay braces). He was very enthusiastic indeed about the Suplex system, saying the ride and handling are greatly improved - as he is a long-time racer of Morgans and a "proper engineer" I always think his opinion is worthwhile!
