Customer interest proves the gaining popularity of 4 and 6 cylinder high performance. In response to this need, Offy has developed a “C” series of competition style high performance manifolds to fill the void between absolute street performance and modified street/race applications. These manifolds have been designed to accept larger carbs of a performance variety because the plenum and runners of the manifold have been opened up to carry the high volume flow required by modified engines at higher RPM’s.The “C” series Offy open plenum design really boosts engine breathing characteristics and greatly improves the torque in mid to higher RPM’s. The torque range of these manifolds has been designed to fit into street modified and competition RPM requirements of the 4 and 6 cylinder engines. Depending on the size of the carb and the engine type, the “C” series has a fantastic range from approximately 2500 RPM delivering great performance thru 7000+ RPM. Naturally the larger the carb, the higher the RPM will be.All 4 cylinder, 2 barrel “C” series manifolds are drilled to accept the two stage Holley Model 5200 carbs or popular Weber 32/36 series carb.