ex. throttle, parts to convert carb opening in fr. housing into a venturi, fitting to change to crankcase pressure for fuel tank & offset rudder blade. can wake up any k&B, but specifically made to compliment the engine being on a prather spitfire.
mic, it is a flat plate style. no rotary barrel, more of a guillotine (sp?) type sliding plate, like the 3.5 prather mod kit or 707 type. fits in place of the stock ex. adapter, ex. gas exits out the lower as in stock setup.