The following should be of interest. Seems to be a stage 3 carb kit for racers in Italy for SV's and Raptors from fast by ferracci in Italy.It eliminates the airbox as you can see in the picture.Here is a dyno run too. It seems the 2nd place finishers in the italian supertwins series uses this with a 750cc weisco piston kit. 75 hp for just this kit I think seems pretty good.
here is a crude translation
Fast By Ferracci in collaboration with Dynojet has put to point kit stage 3 for 650 Suzuki SV and Raptor 650. The kit it previews the elimination of the case filter, the assembly of single filters, and one series of parts in order to modify the calibration of the carburetors. All for euro 225,00 +Iva. It turns out to you are amazing, as it can be found from the diagram. Carried in track on base SV650 from the Rosmoto Team, binding together it to kit Wiseco pistons, it has conquered a second place in the Supertwins Trophy www.supertwins.it