We all know (I hope) that Va (Max manouvering speed) usually increases with increased weight, however the place I currently work owns Cessna C208Bs (Grand Caravans) with a Payload Extender kit (STC). The kit simply introduces a couple of wing fences and reinforces the landing gear legs. This increases MTOW by about 300lb, however the Va is lower than the original of 148. With the kit, it is listed as being 143.
Apparently there is a very simple answer to this! Anyone?
