K Series K20 K24 72mm Throttle Body Tb Gasket PRB PRC RBC RRCK SERIES K20 K24 72MM THROTTLE BODY TB GASKET PRB PRC RBC RRC DUAL BOLT PATTERN There are several changes to note with this throttle body compared to others. First being that it features a 72mm opening (as opposed to the standard 70mm), which equates to more air flow to enter into the engine. In addition, it features a dual bolt pattern, which allows it to fit numerous intake manifold types. Direct fit for PRB PRC and RBC RRC manifolds Will require